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21. [AMPS] Bird Line Section Connector (score: 1): Author: dhearn@ix.netcom.com (dan hearn); Date: Thu, 23 Aug 2001 18:47:48 -0700; There are quite a few Bird line sections in the ham flea markets. Some of them do not have the connector which brings out the leads to the meter. I have found that a PL259 can be modified to do the j; /archives//html/Amps/2001-08/msg00307.html (6,676 bytes)
22. [AMPS] FL2100B (score: 1): Author: dhearn@ix.netcom.com (dan hearn); Date: Wed, 04 Jul 2001 16:44:34 -0700; I recently acquired a new Yaesu FL2100B amp in sealed box in an estate sale. Has anyone tried putting this amp on 17 or 12 meters? Is there a possible RFC resonance problem there? I realize that ther; /archives//html/Amps/2001-07/msg00053.html (6,472 bytes)
23. [AMPS] ALPHA 77DX / SX SERIAL NUMBERS (score: 1): Author: dhearn@ix.netcom.com (dan hearn); Date: Sun, 29 Jul 2001 16:07:37 -0700; I believe mine is a fairly late one. s.n. 3280. The manual front cover says April, 1980 and the latest update on a schematic is 5-80. 73, Dan, N5AR -- FAQ on WWW: http://www.contesting.com/FAQ/amps S; /archives//html/Amps/2001-07/msg00366.html (7,465 bytes)
24. [AMPS] 4cx600JB pinout? (score: 1): Author: dhearn@ix.netcom.com (dan hearn); Date: Tue, 01 May 2001 19:01:20 -0700; Eric: I have some info on the 4cx600J and 4cx600B but nothing on 4cx600JB. The J pinout is 1-SG, 2,4,7-Grid, 3,6,8-cathode, 5-heater. It appears that the other heater pin is the center post on the ba; /archives//html/Amps/2001-05/msg00017.html (7,593 bytes)
25. [AMPS] (no subject) (score: 1): Author: dhearn@ix.netcom.com (dan hearn); Date: Fri, 11 May 2001 17:18:43 -0700; Jim: Try http://www.angenent.org/W7IUV/amp-pix.htm 73, Dan, N5AR -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submissions: amps@contesting.com Administrative requests: amps-REQUEST@contesting.co; /archives//html/Amps/2001-05/msg00199.html (6,438 bytes)
26. [AMPS] care to take a guess..? Alpha problem (score: 1): Author: dhearn@ix.netcom.com (dan hearn); Date: Wed, 30 May 2001 10:36:59 -0700; I bought a used 77DX with problems. The major one was the chain drive on the band switches. On some bands the plate switch indexed properly while the input switch was only partially indexed. On some; /archives//html/Amps/2001-05/msg00527.html (9,428 bytes)
27. [AMPS] (no subject) (score: 1): Author: dhearn@ix.netcom.com (dan hearn); Date: Fri, 09 Mar 2001 15:06:35 -0800; No, they are not. Both are triodes but fil voltage different and the power capabilities are very different. You can find data on the GS 35B by doing a search on "russian tubes". That is how I compare; /archives//html/Amps/2001-03/msg00060.html (7,783 bytes)
28. [AMPS] 8877/GS35b (score: 1): Author: dhearn@ix.netcom.com (dan hearn); Date: Fri, 09 Mar 2001 16:36:19 -0800; My comment was baed on data at www.tubes.ru/techinfo/TransmittingTubes/gs-35b/html which shows typical power outputs of 350-800w depending on plate voltage but a plate dissipation of 1500w. It does a; /archives//html/Amps/2001-03/msg00065.html (8,051 bytes)
29. [AMPS] GS35B Info (score: 1): Author: dhearn@ix.netcom.com (dan hearn); Date: Sat, 10 Mar 2001 16:06:19 -0800; The following information was sent directly to me by Joao Lopes, CT2HME. He suggested posting it for the group. 73, Dan, N5AR ( who now is much better acquainted with the GS35b, Hi) "Power output wil; /archives//html/Amps/2001-03/msg00076.html (9,370 bytes)
30. [AMPS] Phono Jack Problems (score: 1): Author: dhearn@ix.netcom.com (dan hearn); Date: Sun, 25 Mar 2001 14:22:32 -0800; Several posts recently have mentioned intermittent contact in the Tx Gnd circuit of their transceivers. I have had 2 instances where the female contact clip of the chassis connector did not reliably; /archives//html/Amps/2001-03/msg00259.html (6,787 bytes)
31. [AMPS] runaway amp. (score: 1): Author: dhearn@ix.netcom.com (dan hearn); Date: Tue, 20 Feb 2001 09:21:04 -0800; I was working on a similar problem in an old vacuum tube radio during my lunch hour many years ago. I had a signal on the grid,proper voltages on the electrodes, and no output with a good tube. I was; /archives//html/Amps/2001-02/msg00273.html (8,747 bytes)
32. [AMPS] runaway amp. (score: 1): Author: dhearn@ix.netcom.com (dan hearn); Date: Thu, 22 Feb 2001 11:22:32 -0800; Another thought: The problem seems to be heat related. Create a source of hot air which can be directed on various components while the amp is creating dots from your keyer into a dummy load. If I un; /archives//html/Amps/2001-02/msg00301.html (8,490 bytes)
33. [AMPS] Anyone got a microwave oven tranny on the bench ormeasurments from one... (score: 1): Author: dhearn@ix.netcom.com (dan hearn); Date: Tue, 02 Jan 2001 11:17:28 -0800; Bob: Since filter chokes carry d.c. current, I believe they have core air gaps which are not present in a.c. xfmrs. If you remove the laminations and add an air gap when re installing, possibly it co; /archives//html/Amps/2001-01/msg00053.html (8,169 bytes)
34. [AMPS] Amp Problem (score: 1): Author: dhearn@ix.netcom.com (dan hearn); Date: Thu, 12 Oct 2000 08:29:08 -0700; I am restoring a Swan 500 transceiver. The PA seems to be essentially inoperative although all voltages on the tubes are normal and there seems to be adequate RF drive. Everything points to the concl; /archives//html/Amps/2000-10/msg00237.html (7,459 bytes)
35. [AMPS] 8877 Rejuvination (score: 1): Author: dhearn@ix.netcom.com (dan hearn); Date: Fri, 08 Sep 2000 19:24:12 -0700; Recent postings here have described a procedure for degassing glass envelope tantalum plate tubes which have been unused for a lengthy period of time. I believe it was stated that the anode must reac; /archives//html/Amps/2000-09/msg00337.html (7,602 bytes)
36. [AMPS] Hi-Pot Testing 8877 (score: 1): Author: dhearn@ix.netcom.com (dan hearn); Date: Thu, 14 Sep 2000 21:21:02 -0700; When Hi Pot testing an 8877, what numbers are obtained for a good tube between the various elements? A bad tube? tnx, Dan, N5AR -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submissions: amps@con; /archives//html/Amps/2000-09/msg00744.html (6,514 bytes)
37. [AMPS] Power Rectifiers as R.F. Switches (score: 1): Author: dhearn@ix.netcom.com (dan hearn); Date: Thu, 15 Jun 2000 20:27:50 -0700; I had a number of QSO's with K5CX on both SSB and CW before he became a silent key. He was using a home built QSK diode switcher on a 3-1000 linear amp. Instead of a power PIN diode, he used a Diodes; /archives//html/Amps/2000-06/msg00205.html (7,862 bytes)
38. [AMPS] Power Rectifiers as RF Switches (score: 1): Author: dhearn@ix.netcom.com (dan hearn); Date: Fri, 16 Jun 2000 06:05:30 -0700; It is obvious that there is a lot of interest in the use of power diodes for RF switching. It is 5:45 am and I have 15 requests for the jpegs so far. Fortunately, Skip May, WV6F asked for a copy and; /archives//html/Amps/2000-06/msg00208.html (7,532 bytes)
39. [AMPS] Power Rectifiers as RF Switches (score: 1): Author: dhearn@ix.netcom.com (dan hearn); Date: Fri, 16 Jun 2000 19:03:04 -0700; Ed: my understanding is you want just the opposite, slow recovery diodes are needed. You don't want rectification to take place. 73, Dan, N5AR -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submis; /archives//html/Amps/2000-06/msg00221.html (8,894 bytes)
40. [AMPS] Power Rectifiers as R.F. Switches (score: 1): Author: dhearn@ix.netcom.com (dan hearn); Date: Sat, 17 Jun 2000 00:09:38 -0700; I see that the info I had on this subject is now posted on the UC Davis Sonic Server in 2 forms. Tnx to Skipp. It is at http://sonic.ucdavis.edu/so02000.html .To make this complete, here is additiona; /archives//html/Amps/2000-06/msg00224.html (9,579 bytes)

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