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41. Re: [Amps] Re GS-35B hours.. (score: 1): Author: "David H Craig" <davidhcraig@verizon.net>; Date: Sat, 19 Dec 2009 21:47:58 -0500; I concur with this 100%. Each of my GS35bs had a variable transformer on the primary side of the filament transformer and it has a profound effect on performance. I use test-points on my Fluke to det; /archives//html/Amps/2009-12/msg00501.html (12,372 bytes)
42. Re: [Amps] Used tubes (score: 1): Author: "David H Craig" <davidhcraig@verizon.net>; Date: Tue, 12 Jan 2010 19:02:52 -0500; Mike, I bought 2 supposedly NOS GS35b tubes- they were toast, grids audible bouncing around when shook. I didn't have to do that to tell though- the USSR radar units used finger-stock to contact the; /archives//html/Amps/2010-01/msg00106.html (8,744 bytes)
43. Re: [Amps] which HV connector to use? (score: 1): Author: "David H Craig" <davidhcraig@verizon.net>; Date: Tue, 12 Jan 2010 20:20:34 -0500; C connector, HN, or even RG214 with connectors will work fine (commercial TX often use RG214 for 8kv in the States). Otherwise buy a Millen connector & use HV cable- about $20-35 US on Ebay, but chea; /archives//html/Amps/2010-01/msg00110.html (9,316 bytes)
44. Re: [Amps] I dont accept answers to why did Heath die? (score: 1): Author: "David H Craig" <davidhcraig@verizon.net>; Date: Mon, 01 Feb 2010 01:07:27 -0500; As an attorney, I could not have said it better than Glen did (save the mine, wire & power-company thing- thr latter are "usually" immune). Money-hungry, greedy, J.D. BSTRDs are at the root of the pr; /archives//html/Amps/2010-01/msg00643.html (14,020 bytes)
45. Re: [Amps] FW: WD-40 Is Not.... (score: 1): Author: "David H Craig" <davidhcraig@verizon.net>; Date: Fri, 05 Mar 2010 18:18:54 -0500; Guess I am lucky- Copperheads don't come near my home & no Eastern Diamondbacks within 50 miles. I do have approximately 30-40 Black Ratsnakes that enjoy my crawlspace, attic & loft. In 30 years here; /archives//html/Amps/2010-03/msg00098.html (11,916 bytes)
46. Re: [Amps] "Pi" or "Tee" input circuit for a 50Mhz (score: 1): Author: "David H Craig" <davidhcraig@verizon.net>; Date: Sun, 21 Mar 2010 21:19:31 -0400; After trying the "T" based on published designs, I hate it. My 2nd HB 50 MHz amp, with a Pi using front-panel adjustment shafts, is completely flat even though I used the wrong tube Z in computing th; /archives//html/Amps/2010-03/msg00454.html (9,355 bytes)
47. Re: [Amps] Tuned Input for G-G 50Mhz amp (score: 1): Author: "David H Craig" <davidhcraig@verizon.net>; Date: Wed, 24 Mar 2010 22:27:24 -0400; The Orr Handbook 23rd Edition lists it as 120 ohms on page 15-18. I agree with Han-san, a Pi is best. Forget the "T". Dave N3DB _______________________________________________ Amps mailing list Amps@; /archives//html/Amps/2010-03/msg00597.html (11,176 bytes)
48. Re: [Amps] GS-35B; Best choice Int'l shipping? (score: 1): Author: "David H Craig" <davidhcraig@verizon.net>; Date: Tue, 27 Apr 2010 22:51:52 -0400; "Gettering" procedures are online at W4ZT's (SK) site GS35b.com via UR4UL. That said, I personally run the heater for 24-48 hours & then full B+ for another day, 0 issues on 3 tubes so far. Hipot the; /archives//html/Amps/2010-04/msg00683.html (16,042 bytes)
49. Re: [Amps] A word of Caution for my Ham Radio Brethren! (score: 1): Author: "David H Craig" <davidhcraig@verizon.net>; Date: Tue, 18 May 2010 21:20:31 -0400; Most already know I am sure, but some idiot bought the copyright to Heathkit manuals. Ergo, nothing online to find easy, theoretically must be bought. Being made public for so long, however, my legal; /archives//html/Amps/2010-05/msg00187.html (13,575 bytes)
50. [Amps] Heathkit Copyright (score: 1): Author: "David H Craig" <davidhcraig@verizon.net>; Date: Tue, 18 May 2010 23:06:05 -0400; It depends on time of "public domain" & etc. - are you really learned with copyright [not "copywrited"] law? N3DB _______________________________________________ Amps mailing list Amps@contesting.com; /archives//html/Amps/2010-05/msg00194.html (7,198 bytes)
51. Re: [Amps] Possible issue with B- "floating down" (score: 1): Author: "David H Craig" <davidhcraig@verizon.net>; Date: Wed, 15 Sep 2010 23:45:00 -0400; Foating B- above chassis ground is necessary & sound practice. That said, you don't need to fear metering or otherwise called "float" resistors between B- and chassis ground, so long as they are acco; /archives//html/Amps/2010-09/msg00197.html (12,609 bytes)
52. [Amps] GS35b FWB issue (score: 1): Author: "David H Craig" <davidhcraig@verizon.net>; Date: Mon, 11 Jul 2011 00:10:05 -0400; I lost a diode string on an 8x4 string 1N5408 FWB on my single GS35b 6m HB amp. To whit, 8 5408s per leg of a FWB for a total of 32 diodes. Presumably a lightening strike / blown lightening arrestor,; /archives//html/Amps/2011-07/msg00102.html (8,503 bytes)
53. Re: [Amps] GS35b FWB issue (score: 1): Author: "David H Craig" <davidhcraig@verizon.net>; Date: Mon, 11 Jul 2011 03:02:10 -0400; Hi Ian, Transfomer voltage is 240- 3000VAC. Line voltage 245 AC (tongiht anyway). No line work that I know of ( & I would know it where I am). My pole pig is 50ft from my home. Mains, with caps in li; /archives//html/Amps/2011-07/msg00104.html (11,285 bytes)
54. Re: [Amps] GS35b FWB issue (score: 1): Author: "David H Craig" <davidhcraig@verizon.net>; Date: Mon, 11 Jul 2011 12:22:17 -0400; Hi Carl, AC secondary is 3kV where I have tapped it (has 3 more lower V taps). AC line is around 245VAC. Diodes came from Mouser a few years back. The ones I used were from a loose batch, not a reel,; /archives//html/Amps/2011-07/msg00107.html (14,436 bytes)
55. Re: [Amps] GS35b FWB issue (score: 1): Author: "David H Craig" <davidhcraig@verizon.net>; Date: Mon, 11 Jul 2011 14:03:53 -0400; Hi Carl, Yes, I checked for shorts & nada. The transformer, sans FWB & etc performs flawlessly. The repaired FWB also is fine fed by the transformer without the cap bank load... Unless the transforme; /archives//html/Amps/2011-07/msg00111.html (18,470 bytes)
56. Re: [Amps] GS35b FWB issue (score: 1): Author: "David H Craig" <davidhcraig@verizon.net>; Date: Wed, 13 Jul 2011 08:06:46 -0400; Thanks for the input all. Still a bit baffled- as Ian wrote my issue HAS to be in the PS side only- it goes into failure mode with NOTHING at all connected to the tank (this is a single chassis unit; /archives//html/Amps/2011-07/msg00130.html (14,022 bytes)
57. Re: [Amps] GS35b FWB issue (score: 1): Author: "David H Craig" <davidhcraig@verizon.net>; Date: Wed, 13 Jul 2011 13:57:42 -0400; Thanks to all- found the issue(s). 1.) The cap bank, if not breaking down from carbon tracing at normal operating voltage, was probably close to doing so. 2.) The tranformer is shot- it reads 80k ohm; /archives//html/Amps/2011-07/msg00146.html (9,381 bytes)
58. Re: [Amps] 3CX1500A7/8877 vs el cheapo GS-35B (score: 1): Author: "David H Craig" <davidhcraig@verizon.net>; Date: Tue, 31 Jul 2012 23:38:07 -0400; My turn to kick the ball- comparing the 8877 to a GS35b is like apples vs oranges. The Russian tube has a mu of 13 vs 20 for the 8877. The tradeoff- durability & max QRG rating. Exceed the published; /archives//html/Amps/2012-07/msg00477.html (13,698 bytes)
59. Re: [Amps] opps / The planar triode is a GI7B (score: 1): Author: "David H Craig" <davidhcraig@verizon.net>; Date: Thu, 09 Aug 2012 00:01:18 -0400; Aside from the obvious, I'm guessing its an estate sale waiting to happen, what with that nice new HV warning sticker inside. _______________________________________________ Amps mailing list Amps@co; /archives//html/Amps/2012-08/msg00138.html (9,204 bytes)
60. Re: [Amps] GS-35B Pi Tank design (score: 1): Author: "David Craig" <davidhcraig@verizon.net>; Date: Sun, 05 May 2013 01:55:05 -0400; GM Iain, I've included a link here http://www.nd2x.net/gs35-HF.html but seems to me easiest to just calculate the plate load impedance given your planned B+ value and tap accordingly per band. Whethe; /archives//html/Amps/2013-05/msg00090.html (8,231 bytes)

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