From rsauvan at beyondbb.com Sat Jul 5 18:47:38 2014 From: rsauvan at beyondbb.com (Robert Sauvan) Date: Sat, 05 Jul 2014 16:47:38 -0600 Subject: [Hallicrafters] Ht-30 ceramic tub caps Message-ID: <53B8808A.1090206@beyondbb.com> Hi all, Im trying to troubleshoot a problem that I have actually had since getting and working on restoring my HT-30. It works great but I lose power after a while of operating on 20 meters only. I seem to be able to fix the problem for a bit by just rotating the bandswitch to the other bands and when I get back to the 20 meter band it seems to operate OK for a while again. One would just assume it is a dirty bandswitch but I have cleaned the thing a thousand times and it shines. So, Im going to cancel that as my problem. Im thinking something is breaking down and the time it takes for me to switch through the bands and let it sit for a minute, it recovers. According to the manual, the 20 meter issues are around the 12AT7 tube and associated circuitry. This is where it brings me to the tub capacitors. All of the caps related to this circuit are tub caps. The manual does not refer to any voltages for these caps. Im thinking about picking up some "orange dips" with 630 volt rating. Will these work to replace the tub caps in this radio? Is there a way to check any of these caps in the circuit to possibly track down my problem? Thanks-Bob-W0YBS From cateswa at msn.com Mon Jul 7 19:00:50 2014 From: cateswa at msn.com (Walt Cates) Date: Mon, 7 Jul 2014 18:00:50 -0500 Subject: [Hallicrafters] SR-400 K2 relay socket Message-ID: Anyone have a socket for the K2 relay in the SR-400. Best Regards, Walt Cates, WD0GOF Life is nothing but a short preAfterLife condition. From cateswa at msn.com Mon Jul 7 19:35:30 2014 From: cateswa at msn.com (Walt Cates) Date: Mon, 7 Jul 2014 18:35:30 -0500 Subject: [Hallicrafters] SR-400 K2 relay socket In-Reply-To: <53BB2D3D.2060900@wpaperman.com> References: , <53BB2D3D.2060900@wpaperman.com> Message-ID: Dave, Yes sir, it is in fact the exact same relay and socket in the 400 and 2000. Best Regards, Walt Cates, WD0GOF Life is nothing but a short preAfterLife condition. Date: Mon, 7 Jul 2014 18:29:01 -0500 From: dave at wpaperman.com To: cateswa at msn.com Subject: Re: [Hallicrafters] SR-400 K2 relay socket Hi, Walt; I have a number of sockets but not an SR-400 from which I can determine the structure and "pin count". Is this similar to the one in the Hurricane? Dave, W5WP On 7/7/2014 6:00 PM, Walt Cates wrote: Anyone have a socket for the K2 relay in the SR-400. Best Regards, Walt Cates, WD0GOF Life is nothing but a short preAfterLife condition. ______________________________________________________________ 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 radio at daileyservices.com Thu Jul 10 17:33:17 2014 From: radio at daileyservices.com (radio at daileyservices.com) Date: Thu, 10 Jul 2014 15:33:17 -0600 Subject: [Hallicrafters] Hallicrafters station for sale Message-ID: Posting for a good friend My Hallicrafter Station is for sale. HT-32B and SX-101A plus a most excellent R-42 "Reproducer" speaker and CW relay. I found each of these Hallicrafters units after a search for the best looking condition of those offered over ten years ago. Currently, the receiver could use a new power supply filter [incl.] and the rig is putting out less power than it should be. Neither are believed to be serious faults. Also an Astatic (Night Eagle) D-104 microphone (in new condition) is included! Complete great looking station for $650. Contact: Larry W0HXS, Overland Park KS. 913 244 6858 --- This email is free from viruses and malware because avast! Antivirus protection is active. http://www.avast.com From cateswa at msn.com Sat Jul 12 10:46:46 2014 From: cateswa at msn.com (Walt Cates) Date: Sat, 12 Jul 2014 09:46:46 -0500 Subject: [Hallicrafters] HAMFEST KANSAS CITY AREA Message-ID: The Warrensburg WAARC hamfest is Sat July 19 at the Johnson County, Mo fairgrounds. I am taking, fully restored; 1 SR-160, 4 SR-150'S, 1 SR-500, 1 SR-400 CYCLONE II and 1 SR-2000. See http://www.waarci.org/hamfest.htm for information. Best Regards, Walt Cates, WD0GOF Life is nothing but a short preAfterLife condition. From kf9wv at att.net Mon Jul 14 16:41:25 2014 From: kf9wv at att.net (george frost) Date: Mon, 14 Jul 2014 13:41:25 -0700 Subject: [Hallicrafters] (no subject) Message-ID: <1405370485.61930.YahooMailNeo@web180906.mail.ne1.yahoo.com> Looking for any information for the Sky Chief s-14 radio.Very little on the Halli web site and a schematic on Bama. Need the dial face info or a photo of the hands. Thanks...George From radio at daileyservices.com Tue Jul 15 12:49:14 2014 From: radio at daileyservices.com (radio at daileyservices.com) Date: Tue, 15 Jul 2014 10:49:14 -0600 Subject: [Hallicrafters] STEWMAC.COM - Adjustable Toggle Switch Wrench Message-ID: <59A79B13DA9D4A1988F08B7B2E240475@w0eaj> Know those round "nuts" that have milled edges, that hold toggle-switches and such on the front of a receiver? You know, the ones we're always buggering up with slip-joint pliers, saying "THIS TIME I won't mess 'em up!", then you do? Well, GC still makes this wrench that I haven't seen in a long time. dubya dubya dubya dot stewmac.com/Luthier Tools/Types_of_Tools/Wrenches/Adjustable_Toggle_Switch_Wrench.html this one is the cheapest price I've seen at $17.71 Tom - W0EAJ --- This email is free from viruses and malware because avast! Antivirus protection is active. http://www.avast.com From larry112249 at mindspring.com Tue Jul 15 13:10:45 2014 From: larry112249 at mindspring.com (Larry Young) Date: Tue, 15 Jul 2014 10:10:45 -0700 Subject: [Hallicrafters] STEWMAC.COM - Adjustable Toggle Switch Wrench In-Reply-To: <59A79B13DA9D4A1988F08B7B2E240475@w0eaj> References: <59A79B13DA9D4A1988F08B7B2E240475@w0eaj> Message-ID: <001501cfa04f$b804b310$280e1930$@com> http://www.stewmac.com/Luthier_Tools/Types_of_Tools/Wrenches/Adjustable_Togg le_Switch_Wrench.html Works better Thanks Tom of W0EAJ -----Original Message----- From: Hallicrafters [mailto:hallicrafters-bounces at mailman.qth.net] On Behalf Of radio at daileyservices.com Sent: Tuesday, July 15, 2014 9:49 AM To: hallicrafters at mailman.qth.net; ORLIN D. JENKINS; Orlan Subject: [Hallicrafters] STEWMAC.COM - Adjustable Toggle Switch Wrench Know those round "nuts" that have milled edges, that hold toggle-switches and such on the front of a receiver? You know, the ones we're always buggering up with slip-joint pliers, saying "THIS TIME I won't mess 'em up!", then you do? Well, GC still makes this wrench that I haven't seen in a long time. dubya dubya dubya dot stewmac.com/Luthier Tools/Types_of_Tools/Wrenches/Adjustable_Toggle_Switch_Wrench.html this one is the cheapest price I've seen at $17.71 Tom - W0EAJ --- This email is free from viruses and malware because avast! Antivirus protection is active. http://www.avast.com ______________________________________________________________ Hallicrafters mailing list Home: http://mailman.qth.net/mailman/listinfo/hallicrafters Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Hallicrafters at mailman.qth.net List Administrator: Duane Fischer, W8DBF ** For Assistance: dfischer at usol.com ** This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html From kf9wv at att.net Tue Jul 15 13:19:50 2014 From: kf9wv at att.net (george frost) Date: Tue, 15 Jul 2014 10:19:50 -0700 Subject: [Hallicrafters] SX-18 Message-ID: <1405444790.5433.YahooMailNeo@web180902.mail.ne1.yahoo.com> Parting out a sx-18,send me what you may need...KF9WV From hallicrafters at mailman.qth.net Tue Jul 15 13:23:44 2014 From: hallicrafters at mailman.qth.net (mac via Hallicrafters) Date: Tue, 15 Jul 2014 10:23:44 -0700 Subject: [Hallicrafters] STEWMAC.COM - Adjustable Toggle Switch Wrench In-Reply-To: <001501cfa04f$b804b310$280e1930$@com> References: <59A79B13DA9D4A1988F08B7B2E240475@w0eaj> <001501cfa04f$b804b310$280e1930$@com> Message-ID: Check on the nut size here, several different sizes in use now. I have a wrench that looks much like the illustration but it doesn't fit the nuts encountered on most vintage toggle switches. Dennis D. W7QHO Glendale, CA On Jul 15, 2014, at 10:10 AM, Larry Young wrote: > http://www.stewmac.com/Luthier_Tools/Types_of_Tools/Wrenches/Adjustable_Togg From larry112249 at mindspring.com Tue Jul 15 13:35:14 2014 From: larry112249 at mindspring.com (Larry Young) Date: Tue, 15 Jul 2014 10:35:14 -0700 Subject: [Hallicrafters] STEWMAC.COM - Adjustable Toggle Switch Wrench In-Reply-To: References: <59A79B13DA9D4A1988F08B7B2E240475@w0eaj> <001501cfa04f$b804b310$280e1930$@com> Message-ID: <000f01cfa053$23798550$6a6c8ff0$@com> Well Nutz From: mac [mailto:w7qho at aol.com] Sent: Tuesday, July 15, 2014 10:24 AM To: Larry Young Cc: radio at daileyservices.com; hallicrafters at mailman.qth.net; 'ORLIN D. JENKINS'; 'Orlan' Subject: Re: [Hallicrafters] STEWMAC.COM - Adjustable Toggle Switch Wrench Check on the nut size here, several different sizes in use now. I have a wrench that looks much like the illustration but it doesn't fit the nuts encountered on most vintage toggle switches. Dennis D. W7QHO Glendale, CA On Jul 15, 2014, at 10:10 AM, Larry Young wrote: http://www.stewmac.com/Luthier_Tools/Types_of_Tools/Wrenches/Adjustable_Togg From n4tl2tom at gmail.com Thu Jul 17 18:46:42 2014 From: n4tl2tom at gmail.com (Thomas Lewis) Date: Thu, 17 Jul 2014 18:46:42 -0400 Subject: [Hallicrafters] 2014 AWA Annual Convention Theme is Hallicrafters. Message-ID: In case everyone missed this, The AWA convention theme this year is Hallicrafters. http://www.antiquewireless.org/conv-theme.html 73 Tom, N4TL From k7mks at comcast.net Tue Jul 22 23:21:48 2014 From: k7mks at comcast.net (k7mks at comcast.net) Date: Wed, 23 Jul 2014 03:21:48 +0000 (UTC) Subject: [Hallicrafters] M isc. FS In-Reply-To: <813158305.22861714.1406085447019.JavaMail.root@comcast.net> Message-ID: <1562318035.22862888.1406085708349.JavaMail.root@comcast.net> Parting S-76. Everything there but the knobs. What do you need? "Green" SX-101A manual - unmarked. Small repairable tear on front cover. $14 mailed USPS. Thanks joe k7mks From cateswa at msn.com Mon Jul 28 09:52:12 2014 From: cateswa at msn.com (Walt Cates) Date: Mon, 28 Jul 2014 08:52:12 -0500 Subject: [Hallicrafters] SR-150's FOR SALE Message-ID: I have 4 completely refurbished SR-150's. I am keeping 1 and want to pass on three. I accumulated these rigs for testing purposes while I was writing a repair and restoration document for the rig. They all meet or exceed original specs. Each comes with a document binder with a copy of; the original manual, service bulletins, factory change notices and the repair and refurbishing document I wrote for the SR-150. $725 + packing + shipping. For photos and information contact off group cateswa at msn.com Best Regards, Walt Cates, WD0GOF Life is nothing but a short preAfterLife condition. From radio at daileyservices.com Mon Jul 28 11:06:04 2014 From: radio at daileyservices.com (radio at daileyservices.com) Date: Mon, 28 Jul 2014 09:06:04 -0600 Subject: [Hallicrafters] Radios you NEED References: Message-ID: Got a freshly redone S-22R. It LOOKS nice, and IS nice. Not a "10", but all new caps, tubes, speaker, and a couple of resistors. FULL realignment (did it twice, for fun). Also have a VERY PRETTY SX-62A; realigned; taken down to bare metal, primed, and repainted to ACCURATE "h" colors w/"Reproducer" speaker. Both in Denver. Tom - W0EAJ ( radio at daileyservices.com ) --- This email is free from viruses and malware because avast! Antivirus protection is active. http://www.avast.com From mascia.donato at gmail.com Mon Jul 28 18:39:12 2014 From: mascia.donato at gmail.com (Donato Mascia) Date: Tue, 29 Jul 2014 00:39:12 +0200 Subject: [Hallicrafters] SR 2000 Message-ID: Hallicrafters SR 2000 (serial No. 452000 142001), good conditions + power supply P 2000. Low voltage power supply tuning position for approximately 1800 volts. At the end of tuning by going to the location HT, about 2800 volts read on the instrument of P 2000, instead of increasing the anode current is lowered circa 20-40 mA, and a similar reduction also the output power (about 450 watts according in position low voltage is passed to about 300 watts and less in position HT). Even the plate voltage drops from 2800 to about 2500 - 2600 while the voltage of the screen grid appears normal and stable 300-volt low-voltage and high-voltage 400 volts. Change both 8122 and the driver no change. Other voltages and currents all normal. At the receiver nothing to report. Only resistor R 316 on P 2000 (12 kOhm Nominal 25 W) is about 45 kOhm. Replaced by one with the correct value 12 kOhm no change. The grid current without signal is sharply negative and goes up to about 10-15 mA with the signal. The rest all normal, proper the bias. Antenna OK. Could I have some advice for the anomaly ? Perhaps the diodes of the HT ? I thank you for your kindness and competence to restore the noble and venerable apparatus. IZ5URV (former I5MVD) Donato Mascia. From hallicrafterssr2000 at k9axn.com Mon Jul 28 19:47:19 2014 From: hallicrafterssr2000 at k9axn.com (Jim Liles) Date: Mon, 28 Jul 2014 18:47:19 -0500 Subject: [Hallicrafters] SR 2000 In-Reply-To: References: Message-ID: Hi Donato: I don?t know what you mean by position HT The plate voltage dropping from 2800 to 2500 is normal. R316 must be 12K. the value is chosen to drain the negative screen current that is common in the 8122. At 45K ohms the negative screen current can draw the screen voltage up to avalanche levels destroying the 8122?s. If the idle current changes when switching to high power mode, the bias resistors in the P2000 are either out of tolerance or incorrect values. They should ALWAYS be replaced in the P2000 with metal film resistors. They will not change and will hold their tolerances. The radio should deliver 450 to 500 watts to the antenna in low power mode and 900 to 1100 watts to the antenna in high power mode. NOTE: The 8122?s have a vast range of bias variations. This affects the output capabilities in the class AB1 amplifiers used in the SR-2000. A good rule is to use Burle 8122?s or have them tested not only for a match but whether they will work in the SR-2000. The Burle 8122?s are color coded to indicate their bias range. They are Red, Blue, Green, and black. The Blue tubes will work in the SR-2000 without mods and the Green will work but some need circuit changes to make them work properly. I have not seen the Red version and know that they will only deliver about 750 to 850 watts out. The Blue about 950 to 1050 watts out and the Green 1000 to 1150 watts out. The Black 8122?s will not work in the SR-2000 and exceed the design capabilities of the SR-2000. The different output capabilities is a result of the Class AB1 design. Let me know what the HT position is. Good luck and Kindest regards Jim K9AXN -----Original Message----- From: Donato Mascia Sent: Monday, July 28, 2014 5:39 PM To: Hallicrafters at mailman.qth.net Subject: [Hallicrafters] SR 2000 Hallicrafters SR 2000 (serial No. 452000 142001), good conditions + power supply P 2000. Low voltage power supply tuning position for approximately 1800 volts. At the end of tuning by going to the location HT, about 2800 volts read on the instrument of P 2000, instead of increasing the anode current is lowered circa 20-40 mA, and a similar reduction also the output power (about 450 watts according in position low voltage is passed to about 300 watts and less in position HT). Even the plate voltage drops from 2800 to about 2500 - 2600 while the voltage of the screen grid appears normal and stable 300-volt low-voltage and high-voltage 400 volts. Change both 8122 and the driver no change. Other voltages and currents all normal. At the receiver nothing to report. Only resistor R 316 on P 2000 (12 kOhm Nominal 25 W) is about 45 kOhm. Replaced by one with the correct value 12 kOhm no change. The grid current without signal is sharply negative and goes up to about 10-15 mA with the signal. The rest all normal, proper the bias. Antenna OK. Could I have some advice for the anomaly ? Perhaps the diodes of the HT ? I thank you for your kindness and competence to restore the noble and venerable apparatus. IZ5URV (former I5MVD) Donato Mascia. ______________________________________________________________ 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 hallicrafterssr2000 at k9axn.com Mon Jul 28 22:35:57 2014 From: hallicrafterssr2000 at k9axn.com (Jim Liles) Date: Mon, 28 Jul 2014 21:35:57 -0500 Subject: [Hallicrafters] SR 2000 In-Reply-To: References: Message-ID: <367DC6408A894567BA5007130D5B1998@LILESJLAPTOP> Hello again Donato: How much power out can you get from the radio in low and high power mode with 15 ma of screen current? After tuning the radio for maximum 15ma of screen current, further increases in transmit RF drive should cause the anode current to drop. What do you observe when you do that? Kindest regards Jim K9AXN -----Original Message----- From: Donato Mascia Sent: Monday, July 28, 2014 5:39 PM To: Hallicrafters at mailman.qth.net Subject: [Hallicrafters] SR 2000 Hallicrafters SR 2000 (serial No. 452000 142001), good conditions + power supply P 2000. Low voltage power supply tuning position for approximately 1800 volts. At the end of tuning by going to the location HT, about 2800 volts read on the instrument of P 2000, instead of increasing the anode current is lowered circa 20-40 mA, and a similar reduction also the output power (about 450 watts according in position low voltage is passed to about 300 watts and less in position HT). Even the plate voltage drops from 2800 to about 2500 - 2600 while the voltage of the screen grid appears normal and stable 300-volt low-voltage and high-voltage 400 volts. Change both 8122 and the driver no change. Other voltages and currents all normal. At the receiver nothing to report. Only resistor R 316 on P 2000 (12 kOhm Nominal 25 W) is about 45 kOhm. Replaced by one with the correct value 12 kOhm no change. The grid current without signal is sharply negative and goes up to about 10-15 mA with the signal. The rest all normal, proper the bias. Antenna OK. Could I have some advice for the anomaly ? Perhaps the diodes of the HT ? I thank you for your kindness and competence to restore the noble and venerable apparatus. IZ5URV (former I5MVD) Donato Mascia. ______________________________________________________________ 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 mascia.donato at gmail.com Tue Jul 29 06:36:18 2014 From: mascia.donato at gmail.com (Donato Mascia) Date: Tue, 29 Jul 2014 12:36:18 +0200 Subject: [Hallicrafters] SR 2000 In-Reply-To: <367DC6408A894567BA5007130D5B1998@LILESJLAPTOP> References: <367DC6408A894567BA5007130D5B1998@LILESJLAPTOP> Message-ID: Good morning Jim (11:30 AM Local), you are very kind 1) I have some valves is 8122 RCA Burle some red and others black, or a pair of new red Burle. For now I have only been rehearsing with RCA, I do not want to take risks with new valves Burle, the 8122 are very delicate!. 2) HT position corresponds to the P 2000 High Voltage. 3) Today I replace the R316 with a new 12 K 25 Watt came from Nebraska Surplus. 4) The power antenna is a wattmeter-automatic tuner 1 KW. 5) in low power about 350-400 watts max; in Hight power *drops *to about 250-300 W max. always with the screen grid current stable on 15 mA. 6) after the maximum screen current of 15 mA does not have any increase in power beyond the limits given above is that in LV & HV lowvoltage. 7) in normal conditions rightly plate voltage HV may drop in relation to the greater absorption of the valves, but in my case, the voltage drop is also associated with a *decrease* of plate current (!) And output power. How is it that a voltage drop is also associated with a decrease in current? It seems to me an inconsistencythat suggests an alteration in the chain of rectifier-capacity-resistors. 8) correct and stable bias current to 200 mA in both LV & HV. 9) screen grid voltage correct and stable to 300 Volt LV & 400 Volt HV. 10) the voltages are measured on the output of P 2000 on the connection plug , and both the point of measurement of the transceiver shown in the manual. 11) no smoke or odor even in prolonged operation with HT applied. I think to a fault in only P2000. Maybe a short in one of the capacitors 90 uF or alteration of the diodes? Please excuse my verbosity, thanks and regards, Donato Mascia IZ5URV mascia.donato @ gmail.com 2014-07-29 4:35 GMT+02:00 Jim Liles : > Hello again Donato: > > How much power out can you get from the radio in low and high power mode > with 15 ma of screen current? > > After tuning the radio for maximum 15ma of screen current, further > increases in transmit RF drive should cause the anode current to drop. > What do you observe when you do that? > > Kindest regards Jim K9AXN > > > -----Original Message----- > From: Donato Mascia > Sent: Monday, July 28, 2014 5:39 PM > To: Hallicrafters at mailman.qth.net > Subject: [Hallicrafters] SR 2000 > > Hallicrafters SR 2000 (serial No. 452000 142001), good conditions + power > supply P 2000. > Low voltage power supply tuning position for approximately 1800 volts. At > the end of tuning by going to the location HT, about 2800 volts read on the > instrument of P 2000, instead of increasing the anode current is lowered > circa 20-40 mA, and a similar reduction also the output power (about 450 > watts according in position low voltage is passed to about 300 watts and > less in position HT). Even the plate voltage drops from 2800 to about 2500 > - 2600 while the voltage of the screen grid appears normal and stable > 300-volt low-voltage and high-voltage 400 volts. Change both 8122 and the > driver no change. Other voltages and currents all normal. At the receiver > nothing to report. Only resistor R 316 on P 2000 (12 kOhm Nominal 25 W) is > about 45 kOhm. Replaced by one with the correct value 12 kOhm no change. > The grid current without signal is sharply negative and goes up to about > 10-15 mA with the signal. The rest all normal, proper the bias. Antenna OK. > Could I have some advice for the anomaly ? Perhaps the diodes of the HT ? I > thank you for your kindness and competence to restore the noble and > venerable apparatus. > > IZ5URV (former I5MVD) Donato Mascia. > ______________________________________________________________ > 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 hallicrafterssr2000 at k9axn.com Tue Jul 29 10:27:34 2014 From: hallicrafterssr2000 at k9axn.com (Jim Liles) Date: Tue, 29 Jul 2014 09:27:34 -0500 Subject: [Hallicrafters] SR 2000 In-Reply-To: References: <367DC6408A894567BA5007130D5B1998@LILESJLAPTOP> Message-ID: <107D6961808E409C8773B8B92FFFF297@LILESJLAPTOP> Good morning Donato: The drop in high voltage is a result of the doubling circuit design used in the high voltage power system. Ignore it, it is normal. The problem that you have is inadequate drive to the 8122?s. A good way to check the drive is to remove the heat dissipating shield from the 12BY7A driver, wrap a copper sleeve around the tube, attach a scope probe to it and measure the voltage when in transmit mode as you tune the pre-selector and increase the transmit RF drive. You don?t need to enable the high voltage. It should measure 18 to 25 volts on the 15 and 20 meter bands. That level will fully drive the 8122?s. It is quite common to find an SR-2000 behaving as yours does because of inadequate drive. Do a full alignment beginning with measuring the output of the VFO, Heterodyne, and Carrier oscillators. The VFO should be approximately 1.5 to 2.0 volts PP at V2AP7, the Heterodyne as stated in the manual, and Carrier approximately 5 volts PP at V9AP8. Let us know what you find. Kindest regards Jim K9AXN -----Original Message----- From: Donato Mascia Sent: Tuesday, July 29, 2014 5:36 AM To: Jim Liles Cc: Hallicrafters at mailman.qth.net Subject: Re: [Hallicrafters] SR 2000 Good morning Jim (11:30 AM Local), you are very kind 1) I have some valves is 8122 RCA Burle some red and others black, or a pair of new red Burle. For now I have only been rehearsing with RCA, I do not want to take risks with new valves Burle, the 8122 are very delicate!. 2) HT position corresponds to the P 2000 High Voltage. 3) Today I replace the R316 with a new 12 K 25 Watt came from Nebraska Surplus. 4) The power antenna is a wattmeter-automatic tuner 1 KW. 5) in low power about 350-400 watts max; in Hight power drops to about 250-300 W max. always with the screen grid current stable on 15 mA. 6) after the maximum screen current of 15 mA does not have any increase in power beyond the limits given above is that in LV & HV lowvoltage. 7) in normal conditions rightly plate voltage HV may drop in relation to the greater absorption of the valves, but in my case, the voltage drop is also associated with a decrease of plate current (!) And output power. How is it that a voltage drop is also associated with a decrease in current? It seems to me an inconsistencythat suggests an alteration in the chain of rectifier-capacity-resistors. 8) correct and stable bias current to 200 mA in both LV & HV. 9) screen grid voltage correct and stable to 300 Volt LV & 400 Volt HV. 10) the voltages are measured on the output of P 2000 on the connection plug, and both the point of measurement of the transceiver shown in the manual. 11) no smoke or odor even in prolonged operation with HT applied. I think to a fault in only P2000. Maybe a short in one of the capacitors 90 uF or alteration of the diodes? Please excuse my verbosity, thanks and regards, Donato Mascia IZ5URV mascia.donato @ gmail.com 2014-07-29 4:35 GMT+02:00 Jim Liles : Hello again Donato: How much power out can you get from the radio in low and high power mode with 15 ma of screen current? After tuning the radio for maximum 15ma of screen current, further increases in transmit RF drive should cause the anode current to drop. What do you observe when you do that? Kindest regards Jim K9AXN -----Original Message----- From: Donato Mascia Sent: Monday, July 28, 2014 5:39 PM To: Hallicrafters at mailman.qth.net Subject: [Hallicrafters] SR 2000 Hallicrafters SR 2000 (serial No. 452000 142001), good conditions + power supply P 2000. Low voltage power supply tuning position for approximately 1800 volts. At the end of tuning by going to the location HT, about 2800 volts read on the instrument of P 2000, instead of increasing the anode current is lowered circa 20-40 mA, and a similar reduction also the output power (about 450 watts according in position low voltage is passed to about 300 watts and less in position HT). Even the plate voltage drops from 2800 to about 2500 - 2600 while the voltage of the screen grid appears normal and stable 300-volt low-voltage and high-voltage 400 volts. Change both 8122 and the driver no change. Other voltages and currents all normal. At the receiver nothing to report. Only resistor R 316 on P 2000 (12 kOhm Nominal 25 W) is about 45 kOhm. Replaced by one with the correct value 12 kOhm no change. The grid current without signal is sharply negative and goes up to about 10-15 mA with the signal. The rest all normal, proper the bias. Antenna OK. Could I have some advice for the anomaly ? Perhaps the diodes of the HT ? I thank you for your kindness and competence to restore the noble and venerable apparatus. IZ5URV (former I5MVD) Donato Mascia. ______________________________________________________________ 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 magnuson at mac.com Thu Jul 31 18:25:20 2014 From: magnuson at mac.com (Waldo Magnuson) Date: Thu, 31 Jul 2014 22:25:20 +0000 (GMT) Subject: [Hallicrafters] SX-28A Rectifier Replacement Message-ID: <76a240ed-465e-4c74-b2d4-43c8b30a6d54@me.com> I've replaced the 5Z3 rectifier with a Weber Copper Cap Rectifier before (quite awhile ago) ?and thought I'd ask before proceeding. ?Is the following correct? ? ?1) Disconnect the transformer winding to pins 1 and 4 and tape (with a note inside). ? ?2) Connect Weber pin 1 to SO1 (octal plug on back of chassis) pin 4. My Weber is pin 1 cathode, pin 4 n.c. Thanks, ? ?73s ?Skip W7WGM

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