From bcarling at cfl.rr.com Thu Jan 8 08:24:20 2015 From: bcarling at cfl.rr.com (bcarling at cfl.rr.com) Date: Thu, 08 Jan 2015 08:24:20 -0500 Subject: [Hallicrafters] Novice Rig Roundup Message-ID: <54AE8504.542.516799@bcarling.cfl.rr.com> Novice Rig Roundup Hi folks - Please consider participating in NOVICE RIG ROUNDUP next month, February 6 - 13th. Hundreds of stations will take to the airwaves for a week of NOVICE ERA fun using home brew and commercial rigs of up to 45 watts output (mostly tube rigs) and of course lots of straight keys and bugs. There is a Facebook Group and also a web page you can read all the details there! Hope you will give it a try! https://www.facebook.com/groups/624239621035186/ http://NoviceRigRoundup.com Everyone is welcome to participate. 73 de AF4K, Bry Brian Carling, Radio AF4K From mark.k3msb at gmail.com Thu Jan 8 13:42:43 2015 From: mark.k3msb at gmail.com (Mark K3MSB) Date: Thu, 8 Jan 2015 13:42:43 -0500 Subject: [Hallicrafters] SX-101A 1700 Hz Crystal Message-ID: Is this a type HC6/U crystal? 73 Mark K3MSB Sent from my Android phone From robert at isquare.com Fri Jan 9 14:53:04 2015 From: robert at isquare.com (Bob Sullivan) Date: Fri, 9 Jan 2015 14:53:04 -0500 Subject: [Hallicrafters] Knob Wanted Message-ID: <26521CB2-9F0A-48F3-91C9-558190DDBDB5@isquare.com> Looking for the small knob (for 3/16" shaft) used for RIT, AF GAIN on the SR series of transceivers. It's 3/4" in diameter. Thanks in advance! Regards and 73, Bob, W?YVA http://www.isquare.com/personal_pages/ras-hardware.htm From holden7471 at msn.com Sun Jan 11 13:38:01 2015 From: holden7471 at msn.com (Howard Holden) Date: Sun, 11 Jan 2015 10:38:01 -0800 Subject: [Hallicrafters] 2015 Winter Classic Exchange CW Message-ID: The CW CX will run from 1400 UTC January 18 to 0800 UTC January 19 , 2015 (9 AM Eastern Time on Sunday to 3 AM Eastern Time Monday) Suggested Frequencies -- plus/minus QRM Listen up and down 5 to 10 Kc for crystal controlled stations CW 1.810 mc. 3.545 mc. 7.045 mc. 14.045 mc. 21.045 mc. 28.045 mc. 50.100 mc. 144.100 mc. For full CX details, visit: http://classicexchange.org/jan15ann.html Any questions, contact me! WB2AWQ at arrl.net 73, see you next weekend! Howie WB2AWQ/7 From jeff at podengo.com Mon Jan 12 13:27:51 2015 From: jeff at podengo.com (jeff) Date: Mon, 12 Jan 2015 13:27:51 -0500 Subject: [Hallicrafters] S-108 IF transformer caps Message-ID: <70mx3i3tssdkg08kbpwi9rwy.1421087271148@email.android.com> Anyone know the value for a new silver mica capacitor for the IF cans in the above? I've done the research, and anecdotal reports seem to indicate 110 pf. Just wondering if anyone had direct, hands on experience with them. I've studied the process to hollow out the old ones from the coils and will just mount new micas underneath. It appears that the same transformers are used in contemporary radios and precursors such as the SX110, and S-40. I also noticed that two of the transformers use a large straight slot slug, while the third is a paper core with a hex head slug. Was that the way it was made, or am I looking to fix someone else's repair effort? Thanks for any suggestions. Jeff WB3JIH From hallicrafterssr2000 at k9axn.com Thu Jan 15 20:26:54 2015 From: hallicrafterssr2000 at k9axn.com (Jim Liles) Date: Thu, 15 Jan 2015 19:26:54 -0600 Subject: [Hallicrafters] 8122's and the SR-2000 Message-ID: Good evening, If your in the market for 8122?s please read service notes 040A and 042A on the K9AXN web site. Also, make sure there is a return policy that will allow you the opportunity to test them. Most importantly, are they guaranteed, and for how long. Buying them with descriptions like; they are matched; only a few hours on them; they were tested two years ago without saying how they were tested; they were in Grandpas closet for 45 years keeping a passel of mice warm, but know he never would have had anything but good tubes; yep, he had a soft spot for mice; they come from the south west or Mideast with barbeque sauce and quani grass baked onto them; etc.etc.etc. There are good 8122?s available and they are not rare as opinion has it. People have been hording those tubes for years. The notion that you need 4 spare pairs for your SR-2000 or NCL-2000 is goofy. One pair will likely outlast you even if they are moderately abused. By time you need the next pair you probably won?t know where to put them and give them to you wife for Christmas. A gooday to you Kindest regards Jim K9AXN From dfischer at usol.com Sat Jan 17 00:39:56 2015 From: dfischer at usol.com (Duane Fischer, W8DBF) Date: Sat, 17 Jan 2015 00:39:56 -0500 Subject: [Hallicrafters] Duane's Magic Message-ID: <000501d03218$0d8888c0$f454e8cc@hpdc5100mt> For those who have been asking me for the past few years to put some of my Magic video on U Tube, there are three different segments currently there. Enjoy! Duane Fischer, W8DBF - WPE8CXO E-Mail: dfischer at usol.com Hallicrafters web site: www.w9wze.net HHRP web site: hhrp.w9wze.net ----- No virus found in this message. Checked by AVG - www.avg.com Version: 2012.0.2247 / Virus Database: 4257/7984 - Release Date: 10/31/14 Internal Virus Database is out of date. From manualman at juno.com Fri Jan 16 20:47:01 2015 From: manualman at juno.com (manualman at juno.com) Date: Fri, 16 Jan 2015 20:47:01 -0500 Subject: [Hallicrafters] Duane's Magic Message-ID: I tried rubbing the screen, but I couldn't make a link to your videos appear. Pete, wa2cwa On Sat, 17 Jan 2015 00:39:56 -0500 "Duane Fischer, W8DBF" writes: > > > For those who have been asking me for the past few years to put some > of my > Magic video on U Tube, there are three different segments currently > there. > Enjoy! > > > Duane Fischer, W8DBF - WPE8CXO > E-Mail: dfischer at usol.com > Hallicrafters web site: www.w9wze.net > HHRP web site: hhrp.w9wze.net From w1jhs at myfairpoint.net Fri Jan 16 21:20:25 2015 From: w1jhs at myfairpoint.net (Jack Schrader) Date: Fri, 16 Jan 2015 21:20:25 -0500 Subject: [Hallicrafters] ht32b Message-ID: <5CA7F05E0DA9484FB2A341BD94CA1D32@JackPC> First of all let me say that I?m not the best tech in the area of hallicraters or any other rig but I try. I have a ht32b that I?m just getting to after having the power transformer rewound. I found I think the problem and that was with T1 between the first mixer and the 9mHz amplifier is open. I have a second complete sideband generator unit so I removed the whole assembly and replaced it with the second one I have. Being the dunce that I am I did not label all the wires between the sub asm. and the main chassis. I?ve got it pretty well back together except I have an extra purple wire hanging loose. The connected end goes to the junction of R139 6.8k and R140 1.2k. What puzzles me is that the wire is long and it looks to me that it should connect directly to the center connector of the 50 ohm output. If my assumption is correct why is this wire so long. Thanks to all for your thoughts. 73 Jack w1jhs From jim at jlthayer.net Sat Jan 17 12:03:02 2015 From: jim at jlthayer.net (Jim Thayer) Date: Sat, 17 Jan 2015 12:03:02 -0500 Subject: [Hallicrafters] Duane's Magic In-Reply-To: References: Message-ID: Here are the direct links. A search for "Duane Fischer" will turn up the videos also. http://youtu.be/rNeZBJ-1WM0 http://youtu.be/_unpM_vnb58 http://youtu.be/fkGBwQmQF8A 73 de W5JT, Jim Thayer HHI Webmaster http://hallicrafters.net On 16 Jan 2015, at 20:47, manualman at juno.com wrote: > I tried rubbing the screen, but I couldn't make a link to your videos > appear. > Pete, wa2cwa > > On Sat, 17 Jan 2015 00:39:56 -0500 "Duane Fischer, W8DBF" > writes: >> >> >> For those who have been asking me for the past few years to put some >> of my >> Magic video on U Tube, there are three different segments currently >> there. >> Enjoy! >> >> >> Duane Fischer, W8DBF - WPE8CXO >> E-Mail: dfischer at usol.com >> Hallicrafters web site: www.w9wze.net >> HHRP web site: hhrp.w9wze.net > > ______________________________________________________________ > Hallicrafters mailing list > Home: http://mailman.qth.net/mailman/listinfo/hallicrafters > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Hallicrafters at mailman.qth.net > > List Administrator: Duane Fischer, W8DBF > ** For Assistance: dfischer at usol.com ** > > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html From anchor at ec.rr.com Sat Jan 17 13:19:34 2015 From: anchor at ec.rr.com (Al Parker) Date: Sat, 17 Jan 2015 13:19:34 -0500 Subject: [Hallicrafters] ht32b In-Reply-To: <5CA7F05E0DA9484FB2A341BD94CA1D32@JackPC> References: <5CA7F05E0DA9484FB2A341BD94CA1D32@JackPC> Message-ID: <54BAA7B6.8070303@ec.rr.com> Hi Jack, We were away "inland" from ystdy noon until now. Maybe you've had an answer, but not thru the reflector. I'm not sure why this got disconnected during your SB Gen, swap, but anyhow -- The only connx from that junction of "R139 6.8k and R140 1.2k" would be to the diode, CR-101 in the RF output monitoring ckt. The wire on the other side of R-139 does go to the RF-output jack, you could check the continuity between those 2 points to be sure it is. I'm not sure where CR-101 is located, don't feel like hoisting my HT-32 open to see ;-) It could be back near the meter. OK, I just looked in the top of my mk-1, no diode there, but there's a purple wire coming off the meter terminal at the junction of R138 and to the cathode of the diode, CR101. Follow that to find CR101 and hook your purple wire to the other side of the diode. If somebody else has already answered and not cc'd the list, shame on him, if he said the same thing. We'll get that rig on the air one of these days ;-) 73, Al, W8UT www.boatanchors.org www.hammarlund.info "There is nothing -- absolutely nothing -- half so much worth doing as simply messing about in boats" Ratty, to Mole On 1/16/2015 9:20 PM, Jack Schrader wrote: > First of all let me say that I?m not the best tech in the area of hallicraters or any other rig but I try. > > I have a ht32b that I?m just getting to after having the power transformer rewound. I found I think the problem and that was with T1 between > the first mixer and the 9mHz amplifier is open. > > I have a second complete sideband generator unit so I removed the whole assembly and replaced it with the second one I have. Being the dunce that I am I did not label all the wires between the sub asm. and the main chassis. I?ve got it pretty well back together except I have an extra purple wire hanging loose. The connected end goes to the junction of R139 6.8k and R140 1.2k. What puzzles me is that the wire is long and it looks to me that it should connect directly to the center connector of the 50 ohm output. If my assumption is correct why is this wire so long. > > Thanks to all for your thoughts. > > 73 > > Jack w1jhs > ______________________________________________________________ > Hallicrafters mailing list > Home: http://mailman.qth.net/mailman/listinfo/hallicrafters > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Hallicrafters at mailman.qth.net > > List Administrator: Duane Fischer, W8DBF > ** For Assistance: dfischer at usol.com ** > > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > From kkeller1 at comcast.net Sun Jan 18 15:47:03 2015 From: kkeller1 at comcast.net (Kurt Keller) Date: Sun, 18 Jan 2015 15:47:03 -0500 Subject: [Hallicrafters] For Sale 60 assorted S38s, S38As and S39Bs Message-ID: <54BC1BC7.6040304@comcast.net> A friend of mine has asked to me list for sale 60 assorted S38s, S38As and S39Bs that he purchased over the years with the intent of restoring, but health issues will not make that feasible. The condition of these is a mix of parts units up to good ones. Also a small number of caps and tubes included. This is a pickup only and they are located in Newtown CT. Make a reasonable offer and upon inspection open to negotiation. Suggest you call and we can discuss. I have pictures. Kurt Keller From K2RJK at VERIZON.NET Sun Jan 18 16:38:24 2015 From: K2RJK at VERIZON.NET (Ray Keefe) Date: Sun, 18 Jan 2015 16:38:24 -0500 Subject: [Hallicrafters] Radio FS In-Reply-To: <54BC1BC7.6040304@comcast.net> References: <54BC1BC7.6040304@comcast.net> Message-ID: <54BC27D0.1090902@VERIZON.NET> I have recently obtained from the original owner a S108, that has been sitting in his attic since the 1960's. It did not have any rodents living in it, only dust bunnies. It was powered up slowly on a Variac and it came to life just fine the caps reformed just fine. It has all it's original Tiny Chief caps all the tubes are original Hallicrafters. The radio has had very low hours of use on it. It has a couple of cosmetic issues, missing knob, couple of scratches on the top of the case and a small rust spot forming. Many photo's avail of it inside and out, great start for a restoration, the power cord was replace since it was starting to break up. Receives good in all modes on all bands. Asking $125.00 + sh from 08527 CONUS preferred, via USPS or FED EX. Paypal, USPS mo or personal checks all ok. Any ques please email me off the list K2RJK at VERIZON.NET or call me till 10pm EST 732-901-7349 From kkeller1 at comcast.net Sun Jan 18 16:52:28 2015 From: kkeller1 at comcast.net (Kurt Keller) Date: Sun, 18 Jan 2015 16:52:28 -0500 Subject: [Hallicrafters] For Sale 60 assorted S38s, S38As and S39Bs In-Reply-To: <54BC1BC7.6040304@comcast.net> References: <54BC1BC7.6040304@comcast.net> Message-ID: <54BC2B1C.107@comcast.net> My apology, did not include phone # 203-431-9740. On 1/18/15 3:47 PM, Kurt Keller wrote: > A friend of mine has asked to me list for sale 60 assorted S38s, S38As > and S39Bs > that he purchased over the years with the intent of restoring, but > health issues will > not make that feasible. The condition of these is a mix of parts units > up to good ones. > > Also a small number of caps and tubes included. This is a pickup only > and they are located > in Newtown CT. Make a reasonable offer and upon inspection open to > negotiation. > > Suggest you call and we can discuss. I have pictures. > > Kurt Keller > ______________________________________________________________ > Hallicrafters mailing list > Home: http://mailman.qth.net/mailman/listinfo/hallicrafters > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Hallicrafters at mailman.qth.net > > List Administrator: Duane Fischer, W8DBF > ** For Assistance: dfischer at usol.com ** > > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > From jeff at podengo.com Sun Jan 18 22:36:33 2015 From: jeff at podengo.com (jeff at podengo.com) Date: Mon, 19 Jan 2015 03:36:33 +0000 Subject: [Hallicrafters] S-20R IF transformer trimmer caps Message-ID: Hi All -- Moved on to my next project. I've got a sort of working S-20R on the bench right now. After all new caps, a couple of resistors, and good tubes, I get some low level reception. This one was a bit hacked up when I got it -- field coil is gone, replaced with a 1.5K 10 watt resistor, some "odd" soldering jobs, and apparently a low impedance output transfomer sitting loose in the cabinet feeding two headphone jacks that were drilled into the front. I've got things back to the original schematic mostly, except for the field coil filter choke. I've got a good PM speaker, so I will deal. Problem is now that I'm unable to peak the IF transformers. Two of the three cans had trimmer caps that were totally seized up, and one had been cranked on so hard that the screw was stripped out. I disassembled the cans and the trimmers, got everything mving freely again, and put everything back together. I am able to get a fair noise level out of the receiver now, although not nearly what I think it should be. Sensitivity is OK on 80 meters, barley there on 40, and nonexistant on 20 and above. I know this isn't a SSB receiver, but I was actually kind of impressed with the performance on the SSB stations that I could in fact hear. I can get a peak on the IF transformers on T3 and one side of T-1 and T-2. The other side turns clockwise all the way in before the peak occurs. GENTLE pressure on the trimmer brings up more volume, but the peak is still a bit off, and unfortunately, there's no more turns left in the trimmer. I think the receiver is capable of much more than I'm hearing, but I can't seem to get the transformers peaked. Looking for any advice on how to remedy the situation. The trimmer values are 600-1050 and 150-600 pf on T-1 and T-2, and the parts list indicates a "100mmfd nominal" mica trimmer on each side of T-3. I suppose I could add a capacitor in series with the trimmer to extend the range, but that seems like a bit of a hack. Can anyone explain to me what the "nominal" notation means in this case, or recommend a strategy to deal with this? Mouser sells a trimmer cap that is a bit smaller than the stock range, and would require a bit of retrofitting. Or... any suggestions where else to look in the radio that might be the cause of the caps not being able to tune? It's too close to give up now! Thanks all! Jeff WB3JIH From k1lky68 at gmail.com Sun Jan 18 23:26:59 2015 From: k1lky68 at gmail.com (Roy Morgan) Date: Sun, 18 Jan 2015 23:26:59 -0500 Subject: [Hallicrafters] S-20R IF transformer trimmer caps In-Reply-To: References: Message-ID: <0C20D1AB-13AD-43C9-BA40-64591288A556@gmail.com> On Jan 18, 2015, at 10:36 PM, jeff at podengo.com wrote: > Hi All -- > > Moved on to my next project. I've got a sort of working S-20R on the bench right now. > Problem is now that I'm unable to peak the IF transformers. Two of the three cans had trimmer caps that were totally seized up, and one had been cranked on so hard that the screw was stripped out. this is a symptom of a shorted coil winding - the hammer fist who worked on it did not realize that the thing was NOT going to resonate in the normal range of the trimmer and just forced it. > ...I think the receiver is capable of much more than I'm hearing, but I can't seem to get the transformers peaked. Right. Check other capacitances in the circuit to see if somethings amiss: such as a parallel cap which has changed in value. Testing the coils themselves is tough unless you have an LCR meter or a Q meter or RX meter. > > Looking for any advice on how to remedy the situation. The trimmer values are 600-1050 and 150-600 pf on T-1 and T-2, and the parts list indicates a "100mmfd nominal" mica trimmer on each side of T-3. I suppose I could add a capacitor in series with the trimmer to extend the range, but that seems like a bit of a hack. T3 feeds the signal into the grid of the detector where the BFO is also injected. Unhook that BFO coupling cap to see if it is messing up the T3 secondary tuning. If you have a signal generator, feed an IF frequency into the set (at the first mixer grid) and see where the offending transformer is actually resonant (use an RF probe to detect the level at the next point int the circuit). This will tell you if it is above or below where it should be and you can then decide what might be wrong. There are bypass caps at the ?cold? end of those transformers - they may have drifted way off value and not be working. a new cap with two clips on it can be put in parallel with the bypass caps to see if they have failed open. > Can anyone explain to me what the "nominal" notation means in this case, Likely it means a typical value for the cap when it?s adjusted for resonance. > ...Mouser sells a trimmer cap that is a bit smaller than the stock range, and would require a bit of retrofitting. Or... any suggestions where else to look in the radio that might be the cause of the caps not being able to tune? If you have any variable capacitor, hook up some clip leads onto it and see if you can get the stages to peak with the existing trimmer all the way closed and the new variable in parallel- it sounds like more capacitance is needed than the trimmers have. ?trimmer caps screwed all the way down.? A small mica cap temporarily soldered or clipped in parallel with the existing caps will tell if this is the case. Shorted transformer winding. Bypass caps gone kaput I have an S-20 (non-R) and it awaits overhaul. There is no T3 in that one. Roy Roy Morgan RoyMorgan at alum.mit.edu K1LKY Since 1958 From gsantacanav at gmail.com Mon Jan 19 08:21:50 2015 From: gsantacanav at gmail.com (Guido Santacana) Date: Mon, 19 Jan 2015 09:21:50 -0400 Subject: [Hallicrafters] S-20R IF transformer trimmer caps In-Reply-To: <0C20D1AB-13AD-43C9-BA40-64591288A556@gmail.com> References: <0C20D1AB-13AD-43C9-BA40-64591288A556@gmail.com> Message-ID: I have worked on four S20rs. Two of them had shorted windings in T3 with symptoms similar to those described. Replacing T3 from a junk set brought the set back to life and sensitivity back to normal. I have never read about T3 being a common failure item but this was my experience. When properly aligned the S20r works very well in all bands but always a tad better in the lower 3. Best 73s Guido Santacana KP4FAR Sent from my iPad On Jan 19, 2015, at 12:26 AM, Roy Morgan wrote: > > On Jan 18, 2015, at 10:36 PM, jeff at podengo.com wrote: > >> Hi All -- >> >> Moved on to my next project. I've got a sort of working S-20R on the bench right now. >> Problem is now that I'm unable to peak the IF transformers. Two of the three cans had trimmer caps that were totally seized up, and one had been cranked on so hard that the screw was stripped out. > > this is a symptom of a shorted coil winding - the hammer fist who worked on it did not realize that the thing was NOT going to resonate in the normal range of the trimmer and just forced it. > >> ...I think the receiver is capable of much more than I'm hearing, but I can't seem to get the transformers peaked. > > Right. Check other capacitances in the circuit to see if somethings amiss: such as a parallel cap which has changed in value. Testing the coils themselves is tough unless you have an LCR meter or a Q meter or RX meter. > >> >> Looking for any advice on how to remedy the situation. The trimmer values are 600-1050 and 150-600 pf on T-1 and T-2, and the parts list indicates a "100mmfd nominal" mica trimmer on each side of T-3. I suppose I could add a capacitor in series with the trimmer to extend the range, but that seems like a bit of a hack. > > T3 feeds the signal into the grid of the detector where the BFO is also injected. Unhook that BFO coupling cap to see if it is messing up the T3 secondary tuning. > > If you have a signal generator, feed an IF frequency into the set (at the first mixer grid) and see where the offending transformer is actually resonant (use an RF probe to detect the level at the next point int the circuit). This will tell you if it is above or below where it should be and you can then decide what might be wrong. > > There are bypass caps at the ?cold? end of those transformers - they may have drifted way off value and not be working. a new cap with two clips on it can be put in parallel with the bypass caps to see if they have failed open. > >> Can anyone explain to me what the "nominal" notation means in this case, > > Likely it means a typical value for the cap when it?s adjusted for resonance. > >> ...Mouser sells a trimmer cap that is a bit smaller than the stock range, and would require a bit of retrofitting. Or... any suggestions where else to look in the radio that might be the cause of the caps not being able to tune? > > If you have any variable capacitor, hook up some clip leads onto it and see if you can get the stages to peak with the existing trimmer all the way closed and the new variable in parallel- it sounds like more capacitance is needed than the trimmers have. ?trimmer caps screwed all the way down.? A small mica cap temporarily soldered or clipped in parallel with the existing caps will tell if this is the case. > > Shorted transformer winding. > Bypass caps gone kaput > > I have an S-20 (non-R) and it awaits overhaul. There is no T3 in that one. > > Roy > > Roy Morgan > RoyMorgan at alum.mit.edu > K1LKY Since 1958 > > ______________________________________________________________ > Hallicrafters mailing list > Home: http://mailman.qth.net/mailman/listinfo/hallicrafters > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Hallicrafters at mailman.qth.net > > List Administrator: Duane Fischer, W8DBF > ** For Assistance: dfischer at usol.com ** > > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html From icysubdweller at gmail.com Mon Jan 19 12:19:58 2015 From: icysubdweller at gmail.com (Rodney Boleyn) Date: Mon, 19 Jan 2015 09:19:58 -0800 Subject: [Hallicrafters] WTB: SX-17 cabinet Message-ID: Greetings all. Last spring I acquired a nice, clean SX-17 in an aftermarket cabinet (you can see it here: http://www.radiomuseum.org/r/hallicraft_super_skyrider_sx_17_sx17.html). I would really like to have an original Hallicrafters cabinet for it... love the racing stripes! I've asked around a few different places and have been watching eBay, but after a year, no luck so far. If anyone has a nice original SX-17 cabinet you'd be willing to sell, please email me. Maybe you acquired an extra with a parts chassis used in another restoration? Thanks, Rodney From w6zkh at att.net Wed Jan 21 14:13:04 2015 From: w6zkh at att.net (John Neeley) Date: Wed, 21 Jan 2015 11:13:04 -0800 Subject: [Hallicrafters] HT-32a power xmfr needed Message-ID: <1421867584.11791.YahooMailNeo@web184804.mail.gq1.yahoo.com> Well, right in the middle of a QSO, the old +55 year old HT-32a power transformer decided it was tired and quit on me. So, now either I need to find a "used" new one from a parts rig, or find someone who can rewind it for me. I dont have alot invested in the TX and so dont want to put alot into it since being on a low budget from the "head financial officer of the household". If someone has a spare laying around and willing to part with it for a reasonable price, I would like to get it, otherwise this rig will become a parts rig for other hams in need. Also, I see in a thread above at the start of the month, a fellow had his HT-32b rewound. Any info on that would be appreciated too, as that might be a route for me too, if the cost isnt high. Part number for this transformer is 052-400477. John W6ZKH w6zkh at att.net From k1lky68 at gmail.com Wed Jan 21 16:23:21 2015 From: k1lky68 at gmail.com (Roy Morgan) Date: Wed, 21 Jan 2015 16:23:21 -0500 Subject: [Hallicrafters] HT-32a power xmfr needed In-Reply-To: <1421867584.11791.YahooMailNeo@web184804.mail.gq1.yahoo.com> References: <1421867584.11791.YahooMailNeo@web184804.mail.gq1.yahoo.com> Message-ID: On Jan 21, 2015, at 2:13 PM, John Neeley wrote: > Well, right in the middle of a QSO, the old +55 year old HT-32a power transformer decided it was tired and quit on me. So, now either I need to find a "used" new one from a parts rig, or find someone who can rewind it for me. Gary in Maine is your guy. His website lists prices. HT-32: Power ... $224.00 Choke, L-25 ... $126.00 http://members.tripod.com/tubes_tubes_tubes/transformerrewindingservice xfrmrs at roadrunner.com Gary Brown, WZ1M, Transformer Rewind Service 478 Forest Ave. Orono, Me. 04473 Roy Morgan RoyMorgan at alum.mit.edu K1LKY Since 1958 From hallicrafterssr2000 at k9axn.com Wed Jan 21 22:02:26 2015 From: hallicrafterssr2000 at k9axn.com (Jim Liles) Date: Wed, 21 Jan 2015 21:02:26 -0600 Subject: [Hallicrafters] SR-400 or SR-400A test Message-ID: Does anyone have an SR-400 or SR-400A with Hallicrafters finals that is willing to measure the bias voltage at the center lug of the bias pot while in transmit idle. Thanks Jim K9AXN From cateswa at msn.com Wed Jan 21 22:51:43 2015 From: cateswa at msn.com (Walt Cates) Date: Wed, 21 Jan 2015 21:51:43 -0600 Subject: [Hallicrafters] SR-400 or SR-400A test In-Reply-To: References: Message-ID: Jim, Both rigs on the same power supply, Both rigs fully functional, output 200+watts. Idle current set for 70mills in SSB mode MIC GAIN set at minimum. Cyclone rx/-123 tx/-79 Cyclone II rx/-123 tx/-81 Best Regards, Walt Cates, WD0GOF We will not be judged on what we believe, but on what we put into practice. > From: hallicrafterssr2000 at k9axn.com > To: hallicrafters at mailman.qth.net > Date: Wed, 21 Jan 2015 21:02:26 -0600 > Subject: [Hallicrafters] SR-400 or SR-400A test > > Does anyone have an SR-400 or SR-400A with Hallicrafters finals that is willing to measure the bias voltage at the center lug of the bias pot while in transmit idle. > > Thanks Jim K9AXN > ______________________________________________________________ > Hallicrafters mailing list > Home: http://mailman.qth.net/mailman/listinfo/hallicrafters > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Hallicrafters at mailman.qth.net > > List Administrator: Duane Fischer, W8DBF > ** For Assistance: dfischer at usol.com ** > > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html From cateswa at msn.com Thu Jan 22 21:01:54 2015 From: cateswa at msn.com (Walt Cates) Date: Thu, 22 Jan 2015 20:01:54 -0600 Subject: [Hallicrafters] SR-500 project on ebay Message-ID: There is a 500 on ebay. In the photo you can see the VFO tuning cap rotor blades are missing. If anyone decides to take on that project I have a complete 500 VFO, tested and functioning. Best Regards, Walt Cates, WD0GOF We will not be judged on what we believe, but on what we put into practice. From JM at D8ALUS.NET Fri Jan 23 14:37:26 2015 From: JM at D8ALUS.NET (Jack) Date: Fri, 23 Jan 2015 14:37:26 -0500 Subject: [Hallicrafters] SX-101A Main Tuning Knob Message-ID: <00da01d03744$04c57e60$0e507b20$@D8ALUS.NET> Hi folks, I was just introduced to this list by John, W6ZKH. Thanks, John! My SX-101A is in need of the main tuning knob as the one presently on it is a generic kludge and not very good. I'm aware these knobs are fragile, so I'm not expecting miracles. I've ordered the replacement metal skirt and now trying to find the rest of the knob. Please let me know if you have one available or a lead as to where I could find one. Thanks & 73 Jack WA2OLZ From cateswa at msn.com Fri Jan 23 16:49:28 2015 From: cateswa at msn.com (Walt Cates) Date: Fri, 23 Jan 2015 15:49:28 -0600 Subject: [Hallicrafters] RESEARCH HELP SR-160 AND SR-500 Message-ID: Looking for anyone willing to remove the bottom cover of their 160 and or 500 and check the regulated 150v line. Tune up the transmitter for max power out. Monitor the 150v reg line. Note the voltage in receive and in transmit and let me know what you get. Best Regards, Walt Cates, WD0GOF We will not be judged on what we believe, but on what we put into practice. From cateswa at msn.com Sat Jan 24 16:11:19 2015 From: cateswa at msn.com (Walt Cates) Date: Sat, 24 Jan 2015 15:11:19 -0600 Subject: [Hallicrafters] RESEARCH HELP SR-160 AND SR-500 In-Reply-To: References: , Message-ID: Thank you Tom. Every piece of data helps. Best Regards, Walt Cates, WD0GOF We will not be judged on what we believe, but on what we put into practice. Date: Sat, 24 Jan 2015 15:54:35 -0500 Subject: Re: [Hallicrafters] RESEARCH HELP SR-160 AND SR-500 From: n4tl2tom at gmail.com To: cateswa at msn.com Walt, I took my SR-160 out of the cabinet to measure the voltage for you. There was a small #2 machine screw loose inside. So I am glad I got that out before it caused any damage. The radio is powered from a BK Precision Dynascan Isopack Isolation Transformer 120VAC TR-110. I did the measurement with two AC input voltages. With the input at 122.8 VAC Receive 149.4 VDC, Transmit 148.6 VDC With the input at 118.5 VAC Receive 148.8 VDC, Transmit 148.1 VDC. The measurements were made with a Craftsman auto ranging multimeter (982018). The least significant digit kept changing so I used the value I saw the most. 73 Tom. On Fri, Jan 23, 2015 at 4:49 PM, Walt Cates wrote: Looking for anyone willing to remove the bottom cover of their 160 and or 500 and check the regulated 150v line. Tune up the transmitter for max power out. Monitor the 150v reg line. Note the voltage in receive and in transmit and let me know what you get. Best Regards, Walt Cates, WD0GOF We will not be judged on what we believe, but on what we put into practice. ______________________________________________________________ Hallicrafters mailing list Home: http://mailman.qth.net/mailman/listinfo/hallicrafters Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Hallicrafters at mailman.qth.net List Administrator: Duane Fischer, W8DBF ** For Assistance: dfischer at usol.com ** This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html From gharmon at idworld.net Sun Jan 25 00:17:49 2015 From: gharmon at idworld.net (Gary H. Harmon, Jr.) Date: Sat, 24 Jan 2015 23:17:49 -0600 Subject: [Hallicrafters] Highly Modified SX-115 Message-ID: Several months ago I bought a ravaged SX-115 off Craig's List. Someone had attempted to add a monitor scope to the front panel where the s-meter used to be. A white aftermarket s-meter was added after cutting a hole sufficient for the s-meter. The engineering work is something to see, at least part of it. Is anyone aware of a mod of this type? BTW, the price was cheap but they did turn a nice SX-115 into a parts radio. 73, Gary H. Harmon, Jr. - K5JWK - HAM Radio Archaeologist 6003 Archwood San Antonio, TX 78239-1504 210.657.1549h / 210.884.6926c/t gharmon (at) idworld.net Too many projects - Not enough time! "Retirement = Every day is a Saturday except Sunday" http://www.grissomroadcoc.org From hallicrafters at mailman.qth.net Sun Jan 25 18:43:42 2015 From: hallicrafters at mailman.qth.net (Lee via Hallicrafters) Date: Sun, 25 Jan 2015 18:43:42 -0500 Subject: [Hallicrafters] HT-32B Getting it on the air?? Message-ID: <8D2070FE2B12DF2-D38-48923@webmail-m275.sysops.aol.com> Hi, I am working on getting the Halli HT-32B on the air. I got this from SK a couple years ago, now I am getting it going. Here's what I know so far. 1) Looks like the 2 rect. tubes are gone and SS rectifiers are in place . Including getting rid of the bias rect. 2) Original filter caps still there..I have new replacements in stock and will replace all filter caps with new modern ones. 3) All of those black caps with the color codes are still in there 4) I already replaced the power cord with a new 3 wire grounded one. Would like to get it going for the Halli net next weekend!! What is recommended by the Guru's??? 73, Lee Lee Simmonds Summit DCS LLC 260-799-4077 Office 260-403-6936 Cell From anchor at ec.rr.com Sun Jan 25 19:27:29 2015 From: anchor at ec.rr.com (Al Parker) Date: Sun, 25 Jan 2015 19:27:29 -0500 Subject: [Hallicrafters] HT-32B Getting it on the air?? In-Reply-To: <8D2070FE2B12DF2-D38-48923@webmail-m275.sysops.aol.com> References: <8D2070FE2B12DF2-D38-48923@webmail-m275.sysops.aol.com> Message-ID: <54C589F1.3040309@ec.rr.com> Hi Lee, Some thoughts -- Don't worry about the HV filter cap, C172, it's oil filled (unless it's leaking oil). Do worry about the bias rectifier. If it's still the original selenium, replace it with a silicon diode. You will probably have to add some resistance to drop the developed voltage. I can't remember how much, maybe someone who's done it recently does, or just give it a guess and redo as reqd. Adjust the bias as specified. Don't worry about the black caps, most HT-32's are doing fine with them as-is. If it hasn't been powered up for a few yrs, and you have it out of the cabinet, put a 60 watt bulb under it overnite (at least), with a towel or cardboard box over the chassis, and let it drive some moisture out. We'd be happy to have you ck in to The Vintage Sideband Net on Sun., 2-3PM ET, on 14292.5 Net controls K5LYN, in Tex, WB4BPS, in Ala, W8UT, in NC. 73, Al, W8UT www.boatanchors.org www.hammarlund.info "There is nothing -- absolutely nothing -- half so much worth doing as simply messing about in boats" Ratty, to Mole On 1/25/2015 6:43 PM, Lee via Hallicrafters wrote: > > Hi, > I am working on getting the Halli HT-32B on the air. > I got this from SK a couple years ago, now I am getting it going. > > Here's what I know so far. > > 1) Looks like the 2 rect. tubes are gone and SS rectifiers are in place . Including getting rid of the bias rect. > 2) Original filter caps still there..I have new replacements in stock and will replace all filter caps with new modern ones. > 3) All of those black caps with the color codes are still in there > 4) I already replaced the power cord with a new 3 wire grounded one. > > Would like to get it going for the Halli net next weekend!! > > What is recommended by the Guru's??? > 73, > Lee > > > Lee Simmonds > Summit DCS LLC > > 260-799-4077 Office > 260-403-6936 Cell > ______________________________________________________________ > Hallicrafters mailing list > Home: http://mailman.qth.net/mailman/listinfo/hallicrafters > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Hallicrafters at mailman.qth.net > > List Administrator: Duane Fischer, W8DBF > ** For Assistance: dfischer at usol.com ** > > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > From jeff at podengo.com Sun Jan 25 21:27:29 2015 From: jeff at podengo.com (Jeff) Date: Sun, 25 Jan 2015 21:27:29 -0500 Subject: [Hallicrafters] S-20R IF transformer trimmer caps In-Reply-To: <0C20D1AB-13AD-43C9-BA40-64591288A556@gmail.com> References: <0C20D1AB-13AD-43C9-BA40-64591288A556@gmail.com> Message-ID: <54C5A611.3090907@podengo.com> Well, after tearing down the IF cans again, meticulously cleaning, and changing a few more resistors, the radio is now working great! I was able to get a peak on the T-3 transformer, and was just listening to the Brother's Net on 40. I found a .01 paper cap in the band switch that I had missed, and after tearing apart half of the RF deck to get at it, found it was causing much of my sensitivity problems. The former owner removed the field coil and ED speaker from the radio and replaced the coil with a 10 watt 1.5K resistor. It was mounted close to the power transformer, and one could see the sweat on the transformer after 15 minutes of operation. Moved the resistor to another location in the chassis and all seems OK now. I need to find a PM speaker for it, but right now just have it hooked to an R-42. Any thoughts on leaving the resistor as is, or perhaps looking for a choke with 1.5k resistance to match the job that the field coil was doing? I don't have any hum or apparent issues with the radio. And, it's missing one of the small knobs. Anyone have one you would be willing to part with? Thanks for all who wrote with advice! Jeff WB3JIH On 1/18/2015 11:26 PM, Roy Morgan wrote: > On Jan 18, 2015, at 10:36 PM, jeff at podengo.com wrote: > >> Hi All -- >> >> Moved on to my next project. I've got a sort of working S-20R on the bench right now. >> Problem is now that I'm unable to peak the IF transformers. Two of the three cans had trimmer caps that were totally seized up, and one had been cranked on so hard that the screw was stripped out. > this is a symptom of a shorted coil winding - the hammer fist who worked on it did not realize that the thing was NOT going to resonate in the normal range of the trimmer and just forced it. > >> ...I think the receiver is capable of much more than I'm hearing, but I can't seem to get the transformers peaked. > Right. Check other capacitances in the circuit to see if somethings amiss: such as a parallel cap which has changed in value. Testing the coils themselves is tough unless you have an LCR meter or a Q meter or RX meter. > >> Looking for any advice on how to remedy the situation. The trimmer values are 600-1050 and 150-600 pf on T-1 and T-2, and the parts list indicates a "100mmfd nominal" mica trimmer on each side of T-3. I suppose I could add a capacitor in series with the trimmer to extend the range, but that seems like a bit of a hack. > T3 feeds the signal into the grid of the detector where the BFO is also injected. Unhook that BFO coupling cap to see if it is messing up the T3 secondary tuning. > > If you have a signal generator, feed an IF frequency into the set (at the first mixer grid) and see where the offending transformer is actually resonant (use an RF probe to detect the level at the next point int the circuit). This will tell you if it is above or below where it should be and you can then decide what might be wrong. > > There are bypass caps at the ?cold? end of those transformers - they may have drifted way off value and not be working. a new cap with two clips on it can be put in parallel with the bypass caps to see if they have failed open. > >> Can anyone explain to me what the "nominal" notation means in this case, > Likely it means a typical value for the cap when it?s adjusted for resonance. > >> ...Mouser sells a trimmer cap that is a bit smaller than the stock range, and would require a bit of retrofitting. Or... any suggestions where else to look in the radio that might be the cause of the caps not being able to tune? > If you have any variable capacitor, hook up some clip leads onto it and see if you can get the stages to peak with the existing trimmer all the way closed and the new variable in parallel- it sounds like more capacitance is needed than the trimmers have. ?trimmer caps screwed all the way down.? A small mica cap temporarily soldered or clipped in parallel with the existing caps will tell if this is the case. > > Shorted transformer winding. > Bypass caps gone kaput > > I have an S-20 (non-R) and it awaits overhaul. There is no T3 in that one. > > Roy > > Roy Morgan > RoyMorgan at alum.mit.edu > K1LKY Since 1958 > From k1lky68 at gmail.com Sun Jan 25 22:42:50 2015 From: k1lky68 at gmail.com (Roy Morgan) Date: Sun, 25 Jan 2015 22:42:50 -0500 Subject: [Hallicrafters] S-20R IF transformer trimmer caps In-Reply-To: <54C5A611.3090907@podengo.com> References: <0C20D1AB-13AD-43C9-BA40-64591288A556@gmail.com> <54C5A611.3090907@podengo.com> Message-ID: <438394BF-4E6A-4B8C-96DF-B34C93ABE8FA@gmail.com> On Jan 25, 2015, at 9:27 PM, Jeff wrote: > Well, after tearing down the IF cans again, meticulously cleaning, and changing a few more resistors, the radio is now working great! The mysterious disappearing fault! hooray! > I found a .01 paper cap in the band switch that I had missed, The earlier S-20 has a number of caps in and around the band switch and coil area. Tricky work. > I need to find a PM speaker for it, but right now just have it hooked to an R-42. At Parts Express, I find: Boss Audio Systems | Model: BRS65 6-1/2" dual polypropylene cone replacement speaker. Part # 265-378 Weight: 1.45 lbs. $13.50 But you can find less expensive units. > Any thoughts on leaving the resistor as is, or perhaps looking for a choke with 1.5k resistance to match the job that the field coil was doing? Find a choke. Any choke. Add a power resistor if you need to to tame the B+ voltage (less B+ is better). Or reduce the value of the first filter cap (C28) to approach a choke input filter configuration. If there is any hum that creeps in, increase the second filter cap as needed. Put the first filter cap in parallel with the second after the choke and replace C28 with a smaller cap - maybe much smaller. See this web page (referenced on the Playthings of the Past speakers page) for more info: http://radioremembered.org/edspeaker.htm The Hammond chokes at Parts Express are as good as you can get new. This one might be just right: Hammond 156L Filter Choke Hammond Manufacturing Model: 156L Overview Economical "open bracket" channel mount filter chokes are perfect for high voltage power supply filtering. Tolerance of 15% on both inductance and resistance. Inductances measured at rated D.C. current. 5" long leads. Inductance: 5H, DC Current: 75mA, Resistance: 135 ohms, Max DC Volts: 400V. Part # 122-310 Weight: 0.5 lbs. $17.50 There must be cheaper chokes out there - check AES. I did. They have the Hammond 156L for less money, and also a 20 ma choke, 20 H for about the same price. I?m not sure what the total B+ current drain is. Seems that the 6F6 will draw 30 ma or more. IF you wish to use solid state rectifiers, put the 5 volt filament winding in series with the line to buck down the primary voltage on the transformer. Or add a filament transformer with in the radio to buck the line down. This radio was meant for 115 volt line, the Ryders S-20 (non-R) schematic shows. To reduce heat/wear on the 6F6 audio output, ensure it?s cathode bypass cap is new, and increase the cathode resistor. Aim for 80 percent of rated plate dissipation or less. (Subtract cathode voltage from plate voltage to get plate to cathode voltage. Measure cathode resistance and voltage to figure the actual plate+screen current. Or measure plate transformer DC resistance and measure it?s voltage drop to get plate-only current.) Note: type 80 rectifiers are *very* expensive. Make up a 4-pin to octal adapter to use the electrically identical 5Y3. (Or even a 6X4 if you check the ratings and current needed.) If your type 80 is good, you might sell it and buy a whole second radio for the income. My security contractor advises me to neither confirm nor deny that I have any spare type 80?s, and to never even mention the existence of any globe type 80. Sorry, no extra knobs here. The one you need is the old style small pointer knob. There was a report that Playthings Of the Past was going to retire. He?d have what you need. His picture at: http://www.oldradioparts.com/knobs.htm under pointer knobs shows the knob you need. http://www.oldradioparts.com/knob7.jpg http://www.oldradioparts.com/ The site says: "CLOSED.... Jan. 20th to ? (illness) Please do not send any emails until this notice is removed.? By the way, he might have the exact field coil speaker you need for direct replacement. When he?s back, just send the mounting bolt diameter and field coil resistance. Roy Roy Morgan RoyMorgan at alum.mit.edu K1LKY Since 1958 From 1oldlens1 at ix.netcom.com Mon Jan 26 11:44:46 2015 From: 1oldlens1 at ix.netcom.com (Richard Knoppow) Date: Mon, 26 Jan 2015 08:44:46 -0800 Subject: [Hallicrafters] S-20R IF transformer trimmer caps References: <0C20D1AB-13AD-43C9-BA40-64591288A556@gmail.com> <54C5A611.3090907@podengo.com> Message-ID: <4EE073DBA66649F6B6A2E867EAEE039F@VALUED20606295> ----- Original Message ----- From: "Jeff" To: Sent: Sunday, January 25, 2015 6:27 PM Subject: Re: [Hallicrafters] S-20R IF transformer trimmer caps Well, after tearing down the IF cans again, meticulously cleaning, and changing a few more resistors, the radio is now working great! I was able to get a peak on the T-3 transformer, and was just listening to the Brother's Net on 40. I found a .01 paper cap in the band switch that I had missed, and after tearing apart half of the RF deck to get at it, found it was causing much of my sensitivity problems. The former owner removed the field coil and ED speaker from the radio and replaced the coil with a 10 watt 1.5K resistor. It was mounted close to the power transformer, and one could see the sweat on the transformer after 15 minutes of operation. Moved the resistor to another location in the chassis and all seems OK now. I need to find a PM speaker for it, but right now just have it hooked to an R-42. Any thoughts on leaving the resistor as is, or perhaps looking for a choke with 1.5k resistance to match the job that the field coil was doing? I don't have any hum or apparent issues with the radio. And, it's missing one of the small knobs. Anyone have one you would be willing to part with? Thanks for all who wrote with advice! Jeff WB3JIH Have a look at the S-40A, the circuit is nearly identical to the S-20R. The speaker was changed to a PM type and the field coil replaced by a 1500 ohm resistor as in this set. You may want to adjust the bias on the detector to minimise distortion, a scope and signal generator will show when its correct. Actually, since my S-20R had been worked over by someone else and was also missing the original speaker I changed the whole detector circuit to the grid leak biased design used in the S-40A. This has lower distortion than the original and is not sensitive to its bias voltage. The S-20R is a surprizingly good receiver. Of course it runs out of steam on the highest band but most receivers of the period did. I am pretty sure that the LO is tuned _below_ the signal on the top band. -- Richard Knoppow Los Angeles WB6KBL dickburk at ix.netcom.com On 1/18/2015 11:26 PM, Roy Morgan wrote: > On Jan 18, 2015, at 10:36 PM, jeff at podengo.com wrote: > >> Hi All -- >> >> Moved on to my next project. I've got a sort of working >> S-20R on the bench right now. >> Problem is now that I'm unable to peak the IF >> transformers. Two of the three cans had trimmer caps that >> were totally seized up, and one had been cranked on so >> hard that the screw was stripped out. > this is a symptom of a shorted coil winding - the hammer > fist who worked on it did not realize that the thing was > NOT going to resonate in the normal range of the trimmer > and just forced it. > >> ...I think the receiver is capable of much more than I'm >> hearing, but I can't seem to get the transformers peaked. > Right. Check other capacitances in the circuit to see if > somethings amiss: such as a parallel cap which has changed > in value. Testing the coils themselves is tough unless > you have an LCR meter or a Q meter or RX meter. > >> Looking for any advice on how to remedy the situation. >> The trimmer values are 600-1050 and 150-600 pf on T-1 and >> T-2, and the parts list indicates a "100mmfd nominal" >> mica trimmer on each side of T-3. I suppose I could add a >> capacitor in series with the trimmer to extend the range, >> but that seems like a bit of a hack. > T3 feeds the signal into the grid of the detector where > the BFO is also injected. Unhook that BFO coupling cap to > see if it is messing up the T3 secondary tuning. > > If you have a signal generator, feed an IF frequency into > the set (at the first mixer grid) and see where the > offending transformer is actually resonant (use an RF > probe to detect the level at the next point int the > circuit). This will tell you if it is above or below > where it should be and you can then decide what might be > wrong. > > There are bypass caps at the ?cold? end of those > transformers - they may have drifted way off value and not > be working. a new cap with two clips on it can be put in > parallel with the bypass caps to see if they have failed > open. > >> Can anyone explain to me what the "nominal" notation >> means in this case, > Likely it means a typical value for the cap when it?s > adjusted for resonance. > >> ...Mouser sells a trimmer cap that is a bit smaller than >> the stock range, and would require a bit of retrofitting. >> Or... any suggestions where else to look in the radio >> that might be the cause of the caps not being able to >> tune? > If you have any variable capacitor, hook up some clip > leads onto it and see if you can get the stages to peak > with the existing trimmer all the way closed and the new > variable in parallel- it sounds like more capacitance is > needed than the trimmers have. ?trimmer caps screwed all > the way down.? A small mica cap temporarily soldered or > clipped in parallel with the existing caps will tell if > this is the case. > > Shorted transformer winding. > Bypass caps gone kaput > > I have an S-20 (non-R) and it awaits overhaul. There is > no T3 in that one. > > Roy > > Roy Morgan > RoyMorgan at alum.mit.edu > K1LKY Since 1958 > ______________________________________________________________ Hallicrafters mailing list Home: http://mailman.qth.net/mailman/listinfo/hallicrafters Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Hallicrafters at mailman.qth.net List Administrator: Duane Fischer, W8DBF ** For Assistance: dfischer at usol.com ** This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html From brian at lessonsinlutherie.com Mon Jan 26 12:14:43 2015 From: brian at lessonsinlutherie.com (Brian Burns) Date: Mon, 26 Jan 2015 09:14:43 -0800 Subject: [Hallicrafters] S-20R IF transformer trimmer caps Message-ID: -----Original Message----- From: Brian Burns [mailto:brian at lessonsinlutherie.com] Sent: Monday, January 26, 2015 9:14 AM To: 'Richard Knoppow' Subject: RE: [Hallicrafters] S-20R IF transformer trimmer caps Hello guys, I've been enjoying your posts about the S-20R (:->)...It was the first receiver I ever owned, and I had a lot of fun working 40m CW with it in 1955-57. Cheers, Brian -----Original Message----- From: Hallicrafters [mailto:hallicrafters-bounces at mailman.qth.net] On Behalf Of Richard Knoppow Sent: Monday, January 26, 2015 8:45 AM To: Jeff; Hallicrafters at mailman.qth.net Subject: Re: [Hallicrafters] S-20R IF transformer trimmer caps ----- Original Message ----- From: "Jeff" To: Sent: Sunday, January 25, 2015 6:27 PM Subject: Re: [Hallicrafters] S-20R IF transformer trimmer caps Well, after tearing down the IF cans again, meticulously cleaning, and changing a few more resistors, the radio is now working great! I was able to get a peak on the T-3 transformer, and was just listening to the Brother's Net on 40. I found a .01 paper cap in the band switch that I had missed, and after tearing apart half of the RF deck to get at it, found it was causing much of my sensitivity problems. The former owner removed the field coil and ED speaker from the radio and replaced the coil with a 10 watt 1.5K resistor. It was mounted close to the power transformer, and one could see the sweat on the transformer after 15 minutes of operation. Moved the resistor to another location in the chassis and all seems OK now. I need to find a PM speaker for it, but right now just have it hooked to an R-42. Any thoughts on leaving the resistor as is, or perhaps looking for a choke with 1.5k resistance to match the job that the field coil was doing? I don't have any hum or apparent issues with the radio. And, it's missing one of the small knobs. Anyone have one you would be willing to part with? Thanks for all who wrote with advice! Jeff WB3JIH Have a look at the S-40A, the circuit is nearly identical to the S-20R. The speaker was changed to a PM type and the field coil replaced by a 1500 ohm resistor as in this set. You may want to adjust the bias on the detector to minimise distortion, a scope and signal generator will show when its correct. Actually, since my S-20R had been worked over by someone else and was also missing the original speaker I changed the whole detector circuit to the grid leak biased design used in the S-40A. This has lower distortion than the original and is not sensitive to its bias voltage. The S-20R is a surprizingly good receiver. Of course it runs out of steam on the highest band but most receivers of the period did. I am pretty sure that the LO is tuned _below_ the signal on the top band. -- Richard Knoppow Los Angeles WB6KBL dickburk at ix.netcom.com On 1/18/2015 11:26 PM, Roy Morgan wrote: > On Jan 18, 2015, at 10:36 PM, jeff at podengo.com wrote: > >> Hi All -- >> >> Moved on to my next project. I've got a sort of working S-20R on the >> bench right now. >> Problem is now that I'm unable to peak the IF transformers. Two of >> the three cans had trimmer caps that were totally seized up, and one >> had been cranked on so hard that the screw was stripped out. > this is a symptom of a shorted coil winding - the hammer fist who > worked on it did not realize that the thing was NOT going to resonate > in the normal range of the trimmer and just forced it. > >> ...I think the receiver is capable of much more than I'm hearing, but >> I can't seem to get the transformers peaked. > Right. Check other capacitances in the circuit to see if somethings > amiss: such as a parallel cap which has changed in value. Testing the > coils themselves is tough unless you have an LCR meter or a Q meter or > RX meter. > >> Looking for any advice on how to remedy the situation. >> The trimmer values are 600-1050 and 150-600 pf on T-1 and T-2, and >> the parts list indicates a "100mmfd nominal" >> mica trimmer on each side of T-3. I suppose I could add a capacitor >> in series with the trimmer to extend the range, but that seems like a >> bit of a hack. > T3 feeds the signal into the grid of the detector where the BFO is > also injected. Unhook that BFO coupling cap to see if it is messing > up the T3 secondary tuning. > > If you have a signal generator, feed an IF frequency into the set (at > the first mixer grid) and see where the offending transformer is > actually resonant (use an RF probe to detect the level at the next > point int the circuit). This will tell you if it is above or below > where it should be and you can then decide what might be wrong. > > There are bypass caps at the "cold" end of those transformers - they > may have drifted way off value and not be working. a new cap with two > clips on it can be put in parallel with the bypass caps to see if they > have failed open. > >> Can anyone explain to me what the "nominal" notation means in this >> case, > Likely it means a typical value for the cap when it's adjusted for > resonance. > >> ...Mouser sells a trimmer cap that is a bit smaller than the stock >> range, and would require a bit of retrofitting. >> Or... any suggestions where else to look in the radio that might be >> the cause of the caps not being able to tune? > If you have any variable capacitor, hook up some clip leads onto it > and see if you can get the stages to peak with the existing trimmer > all the way closed and the new variable in parallel- it sounds like > more capacitance is needed than the trimmers have. "trimmer caps > screwed all the way down." A small mica cap temporarily soldered or > clipped in parallel with the existing caps will tell if this is the > case. > > Shorted transformer winding. > Bypass caps gone kaput > > I have an S-20 (non-R) and it awaits overhaul. There is no T3 in that > one. > > Roy > > Roy Morgan > RoyMorgan at alum.mit.edu > K1LKY Since 1958 > ______________________________________________________________ Hallicrafters mailing list Home: http://mailman.qth.net/mailman/listinfo/hallicrafters Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Hallicrafters at mailman.qth.net List Administrator: Duane Fischer, W8DBF ** For Assistance: dfischer at usol.com ** This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html ______________________________________________________________ Hallicrafters mailing list Home: http://mailman.qth.net/mailman/listinfo/hallicrafters Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Hallicrafters at mailman.qth.net List Administrator: Duane Fischer, W8DBF ** For Assistance: dfischer at usol.com ** This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html --- This email has been checked for viruses by Avast antivirus software. http://www.avast.com From pincon at erols.com Mon Jan 26 23:10:31 2015 From: pincon at erols.com (Charlie T, K3ICH) Date: Mon, 26 Jan 2015 23:10:31 -0500 Subject: [Hallicrafters] Electric Radio References: Message-ID: <0DB5ED5B2A104B3CB6424B4EBE19ECE6@pinnacle05df05> Please excuse the non-Hallicrafters post, but does anyone know if Electric Radio Magazine ever made a CD collection of past issues available? 73 Charlie k3ICH From manualman at juno.com Tue Jan 27 01:24:17 2015 From: manualman at juno.com (manualman at juno.com) Date: Tue, 27 Jan 2015 01:24:17 -0500 Subject: [Hallicrafters] Electric Radio Message-ID: They have not. Pete, wa2cwa On Mon, 26 Jan 2015 23:10:31 -0500 "Charlie T, K3ICH" writes: > > > Please excuse the non-Hallicrafters post, but does anyone know if > Electric > Radio Magazine ever made a CD collection of past issues available? > > 73 Charlie k3ICH

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