From jeff at podengo.com Tue Dec 1 20:05:08 2015 From: jeff at podengo.com (Jeff) Date: Tue, 1 Dec 2015 20:05:08 -0500 Subject: [Hallicrafters] HT-44 Carrier balance drift In-Reply-To: <565B7648.4010407@podengo.com> References: <565B7648.4010407@podengo.com> Message-ID: <565E43C4.8070905@podengo.com> Thought I'd post an update: Bill, WA9MXQ posted in July 2003 to the list of a similar problem. There are four .01 mfd caps on the 12BH7s. It appears that one or more were leaky, which caused the carrier balance to shift as temperatures changed. Replaced all four and the carrier balance is solid as a rock now from cold start to several hours on. Additionally, the 22K resistors are now operating at around 160 F, well within acceptable limits. I didn't shotgun the capacitors in this rig as they looked like "modern" film capacitors. Spectrum analysis shows everything as per the manual. Posting to the list to save somebody the research time if you've got an HT-44. Jeff WB3JIH On 11/29/2015 5:03 PM, Jeff wrote: > Input appreciated: > > Have a working HT-44 that's getting excellent audio reports and good > spectrum views on air. I've aligned the audio phasing for a good > circle pattern at 1 KHz. > > In going through it, I found the 22K 2 watt resistors feeding the > balanced modulators to have different values. I replaced both with > metal oxide resistors. Voltages on the plates are 80 volts (manual > says 60, but also feeding it at 123 VAC.) After a day or two, I > checked them and they have been clearly subjected to heat -- paint is > now hard to tell what color it was. When I removed the original carbon > comps, one of them was also quite toasted looking. There's no > evidence of any other component stress however. The 12BH7s are > closely matched and test good. > > Second, and maybe related, I am having difficulty maintaining carrier > suppression. At first turn on, the carrier shows quite high- maybe > 5-10 watts out at full power (130 watts). removing the cover and > adjusting the balance pots will quickly take it back to zero, but as > the rig heats, it goes off again. Eventually, it stops "drifting" and > I'm able to set it so it stays suppressed. > > The 22K resistors appear to drop the full B+ to the stated voltages, > so I would expect for them to get warm. It bothers me to see them > thermally stressed like that though. I suppose I could put in a > couple of 5 watt resistors, but that seems like it might just be > masking a problem. > > As I said, the rig is getting excellent reports. I have it slaved to > a SX-117 and am successfully using it in transceive configuration, so > I don't want to overly tinker with something that's more or less > working. It's just that the carrier balance controls are inconvenient > to have to tweak. > > If anybody out there has experience with this rig, let me know. > Perhaps it's just the nature of the beast? I do know that my other > phasing rigs will hold carrier balance well enough, so I'd be > disappointed to hear that this one wont. > > Jeff > WB3JIH > > ______________________________________________________________ > 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 manualman at juno.com Sun Dec 6 11:17:11 2015 From: manualman at juno.com (manualman at juno.com) Date: Sun, 6 Dec 2015 11:17:11 -0500 Subject: [Hallicrafters] 2015 Clearing Out Old Manuals - They're Going To Recycling - Originals Available Too Message-ID: Here in 2015, I found time to go through some more of my file folders and purge the older replications that were done roughly 20 plus years ago and send them all to paper recycling. None of them meet my current quality standards. I decided to post the list and see if anyone wanted this stuff before I send it all off to the recycling center at the end of December or early January. All manual replications, 5 pages, 50 pages, 100 pages, etc. are $1 each(basically time and material) plus shipping. I also purged a number of originals that are excess to my needs. They are also listed separately in the PDF and individually priced. To view the PDF list and the details of procurement, I posted it all on AMFone.net. You don't have to a member to view the list. At the bottom of the blurb, there is a PDF. http://amfone.net/Amforum/index.php?topic=41013.0 Pete, wa2cwa From ss409ss at aol.com Sat Dec 19 22:01:11 2015 From: ss409ss at aol.com (Richy) Date: Sat, 19 Dec 2015 22:01:11 -0500 Subject: [Hallicrafters] Hurricane Message-ID: <85811BDE-6384-494F-8301-8E3F2EFFDBB2@aol.com> Hi Rich here, A month or so ago, I removed my blower motor and cleaned and oiled it up, put it back in and it's now blowing the 3 amp fuse. I picked up a spare from Jim a while back as this one was getting a little noisy. So I installed the new one, checked around the chassis to see if I Twinkie fingered anything and alas, I'm still popping the 3 amp fuse. I have the schematic and I'm studying it now. If anyone has any ideas on where to look or any ideas, thanks in advance! Lol Merry Christmas and happy holidays!! Sent from my iPhone From bill.riches at verizon.net Fri Dec 25 09:04:15 2015 From: bill.riches at verizon.net (billriches) Date: Fri, 25 Dec 2015 09:04:15 -0500 Subject: [Hallicrafters] PS-500 Message-ID: <008201d13f1d$24374b20$6ca5e160$@verizon.net> Looking for a PS-500 supply. Any leads would be appreciated. 73, Bill, WA2DVU Cape May, NJ --- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus From manualman at juno.com Mon Dec 28 11:24:33 2015 From: manualman at juno.com (manualman at juno.com) Date: Mon, 28 Dec 2015 11:24:33 -0500 Subject: [Hallicrafters] Clearing Out Old Manuals - Going To Recycling - Final Update Message-ID: Due to holiday schedules, end of year time off, etc., the manuals designated for recycling will not go until January 5 or 6. So if anyone still wants anything, check the latest PDF update below. And, I don't know where these rumers come from; this is NOT a going out of business sale. Also dealers, resellers, and the "I want to make a quick buck" - types need not apply. REF: On Sun, 6 Dec 2015 11:17:11 -0500 writes: Here in 2015, I found time to go through some more of my file folders and purge the older replications that were done roughly 20 plus years ago and send them all to paper recycling. None of them meet my current quality standards. I decided to post the list and see if anyone wanted this stuff before I send it all off to the recycling center at the end of December or early January. All manual replications, 5 pages, 50 pages, 100 pages, etc. are $1 each(basically time and material) plus shipping. I also purged a number of originals that are excess to my needs. They are also listed separately in the PDF and individually priced. To view the PDF list and the details of procurement, I posted it all on AMFone.net. You don't have to a member to view the list. At the bottom of the blurb, there is a PDF.http://amfone.net/Amforum/index.php?topic=41013.0 Pete, wa2cwa From manualman at juno.com Mon Dec 28 14:51:00 2015 From: manualman at juno.com (manualman at juno.com) Date: Mon, 28 Dec 2015 14:51:00 -0500 Subject: [Hallicrafters] Clearing Out Old Manuals - I fixed the link Message-ID: Sorry for the redundant posts. It was just pointed out to me there is a period directly adjacent to the http link causing it to not function correctly. Here is the corrected link. http://amfone.net/Amforum/index.php?topic=41013.0 From franco at py1epu.com Mon Dec 28 14:55:26 2015 From: franco at py1epu.com (Franco -PY1EPU) Date: Mon, 28 Dec 2015 17:55:26 -0200 Subject: [Hallicrafters] RES: Clearing Out Old Manuals - I fixed the link In-Reply-To: References: Message-ID: <015701d141a9$b522cbd0$1f686370$@py1epu.com> 73, Franco PY1EPU ? GG87kd?? PY4EPU ? GG88p0 Member: CWSP ?- ? LABRE RJ ? - ? ARRL ? - ? SKCC - SIDESWIPER ( SSN ) FISTS CW Club - The International Morse Preservation Society Collins Collectors Association?? -?? Drake Collectors Association. North American QRP CW Club (NAQCC)? - New England QRP Club ( NEQRP) Vibroplex Collectors Association?? -? Essex CW Amateur Radio Club (ECWARC) Amateur Radio Moonbounce Communications - 144 Mhz (Earth - Moon - Earth) ======================================================================== -----Mensagem original----- De: Hallicrafters [mailto:hallicrafters-bounces at mailman.qth.net] Em nome de manualman at juno.com Enviada em: segunda-feira, 28 de dezembro de 2015 17:51 Para: boatanchors at mailman.qth.net Cc: national at mailman.qth.net; amradio at mailman.qth.net; heathkit at mailman.qth.net; hallicrafters at mailman.qth.net; lafayette at mailman.qth.net Assunto: Re: [Hallicrafters] Clearing Out Old Manuals - I fixed the link Sorry for the redundant posts. It was just pointed out to me there is a period directly adjacent to the http link causing it to not function correctly. Here is the corrected link. http://amfone.net/Amforum/index.php?topic=41013.0 ______________________________________________________________ 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 --- Este email foi escaneado pelo Avast antiv?rus. https://www.avast.com/antivirus From a69galaxie500xl at comcast.net Tue Dec 29 20:14:20 2015 From: a69galaxie500xl at comcast.net (Paul Mobley) Date: Tue, 29 Dec 2015 19:14:20 -0600 Subject: [Hallicrafters] HT-37 selenium rectifier replacement..HELP!!!! Message-ID: Please, can anyone give me detailed info on replacing selenium rectifier in my HT-37, with diode. I am a beginner with electronics and having real trouble trying to understand the whole bias supply circuit. I don't know what value of dropping resistor to use and am confused as to weather the resistor should go to the anode or the cathode side of the diode. The whole negative voltage bias thing is very confusing. Please help! Thanks, Paul Sent from my iPhone From mark.k3msb at gmail.com Wed Dec 30 00:13:34 2015 From: mark.k3msb at gmail.com (Mark K3MSB) Date: Wed, 30 Dec 2015 00:13:34 -0500 Subject: [Hallicrafters] HT-37 selenium rectifier replacement..HELP!!!! In-Reply-To: References: Message-ID: Paul It's been a long time since I did this to my HT-37. I would figure on a voltage increase of about 10V with the new diode. Since it's a bias circuit, figure low current, about 10 mA.. That would mean a resistance of about 1K. A 1/2W resistor should be fine. What is the RMS voltage of the tap that's feeding the diode? Whatever it is, multiple by 1.414 to get the peak rating for the diode. Diodes and resistors as dirt cheap; I'd oversize the heck out of both of them..... 73 Mark K3MSB Mark K3MSB On Tue, Dec 29, 2015 at 8:14 PM, Paul Mobley wrote: > Please, can anyone give me detailed info on replacing selenium rectifier > in my HT-37, with diode. I am a beginner with electronics and having real > trouble trying to understand the whole bias supply circuit. I don't know > what value of dropping resistor to use and am confused as to weather the > resistor should go to the anode or the cathode side of the diode. The whole > negative voltage bias thing is very confusing. Please help! > > Thanks, > Paul > > Sent from my iPhone > ______________________________________________________________ > 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 Wed Dec 30 08:53:04 2015 From: anchor at ec.rr.com (Al Parker) Date: Wed, 30 Dec 2015 08:53:04 -0500 Subject: [Hallicrafters] HT-37 selenium rectifier replacement..HELP!!!! In-Reply-To: References: Message-ID: <5683E1C0.8080303@ec.rr.com> Hi Paul, et al, Mark's right. There's nothing that should confuse you about the circuit, but it can be difficult to understand the diagrams sometimes. Nothing terribly critical here, it's low voltage, low current. The resistor can go on either side if the diode, it's in series either place. In my experience, I think I've used a larger R value, but basically any one that will allow you to adjust the bias voltage to -49v (IIRC) at the test point to the finals will do the job. If it hasn't already been done, you should also solid state the HV and LV rectifiers. The HT-37 & HT-32 power xfmrs are well know for developing a short between the HV winding and a filament winding. That's fatal to the xfmr. Removing the filament winding from the ckt will avoid this (I speak from grim experience(s) on this one). You can see some pix and instructions on this at , about half way down the page. This is a good forum, if you have any questions ask them here. 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 12/30/2015 12:13 AM, Mark K3MSB wrote: > Paul > > It's been a long time since I did this to my HT-37. > > I would figure on a voltage increase of about 10V with the new diode. > Since it's a bias circuit, figure low current, about 10 mA.. > > That would mean a resistance of about 1K. A 1/2W resistor should be fine. > > What is the RMS voltage of the tap that's feeding the diode? Whatever it > is, multiple by 1.414 to get the peak rating for the diode. > > Diodes and resistors as dirt cheap; I'd oversize the heck out of both of > them..... > > 73 Mark K3MSB > > > Mark K3MSB > > > > > On Tue, Dec 29, 2015 at 8:14 PM, Paul Mobley > wrote: > >> Please, can anyone give me detailed info on replacing selenium rectifier >> in my HT-37, with diode. I am a beginner with electronics and having real >> trouble trying to understand the whole bias supply circuit. I don't know >> what value of dropping resistor to use and am confused as to weather the >> resistor should go to the anode or the cathode side of the diode. The whole >> negative voltage bias thing is very confusing. Please help! >> >> Thanks, >> Paul >> >> Sent from my iPhone >> ________ From Jbrannig at verizon.net Wed Dec 30 09:46:51 2015 From: Jbrannig at verizon.net (Jim) Date: Wed, 30 Dec 2015 09:46:51 -0500 Subject: [Hallicrafters] HT-37 selenium rectifier replacement..HELP!!!! In-Reply-To: References: Message-ID: <303E215F71B64CED836528811FBE4A20@OwnerPC> Paul, It would be useful to obtain a copy of the ARRL Handbook. This publication contains a wealth of electronics knowledge, including bias circuits and explanations. 73, Jim -----Original Message----- From: Paul Mobley Sent: Tuesday, December 29, 2015 8:14 PM To: hallicrafters at mailman.qth.net Subject: [Hallicrafters] HT-37 selenium rectifier replacement..HELP!!!! Please, can anyone give me detailed info on replacing selenium rectifier in my HT-37, with diode. I am a beginner with electronics and having real trouble trying to understand the whole bias supply circuit. I don't know what value of dropping resistor to use and am confused as to weather the resistor should go to the anode or the cathode side of the diode. The whole negative voltage bias thing is very confusing. Please help! Thanks, Paul Sent from my iPhone ______________________________________________________________ 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 a69galaxie500xl at comcast.net Wed Dec 30 18:43:41 2015 From: a69galaxie500xl at comcast.net (a69galaxie500xl at comcast.net) Date: Wed, 30 Dec 2015 23:43:41 +0000 (UTC) Subject: [Hallicrafters] HT-37 selenium rectifier replacement..HELP!!!! In-Reply-To: <5683E1C0.8080303@ec.rr.com> References: <5683E1C0.8080303@ec.rr.com> Message-ID: <1134172118.9411003.1451519021747.JavaMail.zimbra@comcast.net> Thank you guys, I appreciate the advice and feel comfortable enough now to proceed. Like I said, I'm green and am sure I will have many more questions. Very happy to have found this forum! Thanks again & 73 Paul KG5KVW ----- Original Message ----- From: "Al Parker" To: "Mark K3MSB" , "Paul Mobley" Cc: "List Hallicrafters" Sent: Wednesday, December 30, 2015 7:53:04 AM Subject: Re: [Hallicrafters] HT-37 selenium rectifier replacement..HELP!!!! Hi Paul, et al, Mark's right. There's nothing that should confuse you about the circuit, but it can be difficult to understand the diagrams sometimes. Nothing terribly critical here, it's low voltage, low current. The resistor can go on either side if the diode, it's in series either place. In my experience, I think I've used a larger R value, but basically any one that will allow you to adjust the bias voltage to -49v (IIRC) at the test point to the finals will do the job. If it hasn't already been done, you should also solid state the HV and LV rectifiers. The HT-37 & HT-32 power xfmrs are well know for developing a short between the HV winding and a filament winding. That's fatal to the xfmr. Removing the filament winding from the ckt will avoid this (I speak from grim experience(s) on this one). You can see some pix and instructions on this at , about half way down the page. This is a good forum, if you have any questions ask them here. 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 12/30/2015 12:13 AM, Mark K3MSB wrote: > Paul > > It's been a long time since I did this to my HT-37. > > I would figure on a voltage increase of about 10V with the new diode. > Since it's a bias circuit, figure low current, about 10 mA.. > > That would mean a resistance of about 1K. A 1/2W resistor should be fine. > > What is the RMS voltage of the tap that's feeding the diode? Whatever it > is, multiple by 1.414 to get the peak rating for the diode. > > Diodes and resistors as dirt cheap; I'd oversize the heck out of both of > them..... > > 73 Mark K3MSB > > > Mark K3MSB > > > > > On Tue, Dec 29, 2015 at 8:14 PM, Paul Mobley > wrote: > >> Please, can anyone give me detailed info on replacing selenium rectifier >> in my HT-37, with diode. I am a beginner with electronics and having real >> trouble trying to understand the whole bias supply circuit. I don't know >> what value of dropping resistor to use and am confused as to weather the >> resistor should go to the anode or the cathode side of the diode. The whole >> negative voltage bias thing is very confusing. Please help! >> >> Thanks, >> Paul >> >> Sent from my iPhone >> ________ From mark.k3msb at gmail.com Wed Dec 30 22:07:33 2015 From: mark.k3msb at gmail.com (Mark K3MSB) Date: Wed, 30 Dec 2015 22:07:33 -0500 Subject: [Hallicrafters] HT-37 selenium rectifier replacement..HELP!!!! In-Reply-To: <1134172118.9411003.1451519021747.JavaMail.zimbra@comcast.net> References: <5683E1C0.8080303@ec.rr.com> <1134172118.9411003.1451519021747.JavaMail.zimbra@comcast.net> Message-ID: Paul Look for an old resistance substitution box at a hamfest. This will help you find the correct value. You can find them for under $10; under $5 sometimes. After all, who would ever need such an antiquated device in this day and age, eh ? 73 Mark K3MSB On Wed, Dec 30, 2015 at 6:43 PM, wrote: > Thank you guys, > > I appreciate the advice and feel comfortable enough now to proceed. > Like I said, I'm green and am sure I will have > many more questions. Very happy to have found this forum! > > Thanks again & 73 > > Paul KG5KVW > > ------------------------------ > *From: *"Al Parker" > *To: *"Mark K3MSB" , "Paul Mobley" < > a69galaxie500xl at comcast.net> > *Cc: *"List Hallicrafters" > *Sent: *Wednesday, December 30, 2015 7:53:04 AM > *Subject: *Re: [Hallicrafters] HT-37 selenium rectifier > replacement..HELP!!!! > > > Hi Paul, et al, > Mark's right. There's nothing that should confuse you about the > circuit, but it can be difficult to understand the diagrams sometimes. > Nothing terribly critical here, it's low voltage, low current. The > resistor can go on either side if the diode, it's in series either > place. In my experience, I think I've used a larger R value, but > basically any one that will allow you to adjust the bias voltage to -49v > (IIRC) at the test point to the finals will do the job. > If it hasn't already been done, you should also solid state the HV > and > LV rectifiers. The HT-37 & HT-32 power xfmrs are well know for > developing a short between the HV winding and a filament winding. > That's fatal to the xfmr. Removing the filament winding from the ckt > will avoid this (I speak from grim experience(s) on this one). You can > see some pix and instructions on this at > , about half way down the page. > This is a good forum, if you have any questions ask them here. > 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 12/30/2015 12:13 AM, Mark K3MSB wrote: > > Paul > > > > It's been a long time since I did this to my HT-37. > > > > I would figure on a voltage increase of about 10V with the new diode. > > Since it's a bias circuit, figure low current, about 10 mA.. > > > > That would mean a resistance of about 1K. A 1/2W resistor should be > fine. > > > > What is the RMS voltage of the tap that's feeding the diode? Whatever it > > is, multiple by 1.414 to get the peak rating for the diode. > > > > Diodes and resistors as dirt cheap; I'd oversize the heck out of both of > > them..... > > > > 73 Mark K3MSB > > > > > > Mark K3MSB > > > > > > > > > > On Tue, Dec 29, 2015 at 8:14 PM, Paul Mobley < > a69galaxie500xl at comcast.net> > > wrote: > > > >> Please, can anyone give me detailed info on replacing selenium rectifier > >> in my HT-37, with diode. I am a beginner with electronics and having > real > >> trouble trying to understand the whole bias supply circuit. I don't know > >> what value of dropping resistor to use and am confused as to weather the > >> resistor should go to the anode or the cathode side of the diode. The > whole > >> negative voltage bias thing is very confusing. Please help! > >> > >> Thanks, > >> Paul > >> > >> Sent from my iPhone > >> ________ > > From k9cox at charter.net Thu Dec 31 05:39:21 2015 From: k9cox at charter.net (Ross Stenberg) Date: Thu, 31 Dec 2015 04:39:21 -0600 Subject: [Hallicrafters] HT-37 selenium rectifier replacement..HELP!!!! In-Reply-To: References: <5683E1C0.8080303@ec.rr.com><1134172118.9411003.1451519021747.JavaMail.zimbra@comcast.net> Message-ID: I find that is just as easy to use Ohms law, eh! 73 Ross K9COX -----Original Message----- From: Mark K3MSB Sent: Wednesday, December 30, 2015 9:07 PM To: Paul Mobley Cc: Al W8UT ; List Hallicrafters Subject: Re: [Hallicrafters] HT-37 selenium rectifier replacement..HELP!!!! Paul Look for an old resistance substitution box at a hamfest. This will help you find the correct value. You can find them for under $10; under $5 sometimes. After all, who would ever need such an antiquated device in this day and age, eh ? 73 Mark K3MSB

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