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41. [AMPS] SB-1000 mods? (score: 1): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Mon, 10 Sep 2001 18:47:13 +0100; Still watching those old black-and-white British war movies, I see... That's the idea! It will help a lot if someone in the USA can do the research on components and availability. 73 from Ian G3SEK E; /archives//html/Amps/2001-09/msg00192.html (9,653 bytes)
42. [AMPS] SB-1000 mods? (score: 1): Author: 2@vc.net (2); Date: Mon, 10 Sep 2001 13:41:34 -0700; tnx, Ian. Spare parts there are reportedly devilishly hard to get. - R. L. Measures, 805.386.3734, AG6K, www.vcnet.com/measures. end -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submissions: am; /archives//html/Amps/2001-09/msg00193.html (8,877 bytes)
43. [AMPS] SB-1000 mods? (score: 1): Author: Mike" <W4EF@dellroy.com (Mike); Date: Tue, 11 Sep 2001 02:57:45 -0700; Wouldn't the 4CX5000 tend to have a larger filter capacitor, and thus a bit more energy to dump, or is peak current the real concern? With Rich's example of the 10 ohm glitch R in the SB-220, and ass; /archives//html/Amps/2001-09/msg00200.html (11,091 bytes)
44. [AMPS] SB-1000 mods? (score: 1): Author: 2@vc.net (2); Date: Tue, 11 Sep 2001 09:25:17 -0700; // The "Plywood Box" amplifier has >1000-joules of stored energy in the filter C . A SB-220 amplifier has c. 80-joules. Initially, the PB had an intermittent parasite problem c.68MHz. Until I came u; /archives//html/Amps/2001-09/msg00203.html (12,487 bytes)
45. [AMPS] SB-1000 mods? (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Tue, 11 Sep 2001 20:44:15 -0400; The 4 by 5 will have higher voltage, but the tube will easily handle more impact than a small tube. Every system needs to be looked at in view of the total system. There is no average plate choke. T; /archives//html/Amps/2001-09/msg00205.html (9,456 bytes)
46. [AMPS] SB-1000 mods? (score: 1): Author: 2@vc.net (2); Date: Tue, 11 Sep 2001 18:34:31 -0700; // Mr. Rauch: Do you know of a case where a 3-500Z reportedly shorted after a glitch resistor was added in series with the anode supply And a frangible grid resistor was added? If so, who? tnx. - R.; /archives//html/Amps/2001-09/msg00206.html (9,618 bytes)
47. [AMPS] SB-1000 mods? (score: 1): Author: steve@2cls.com (steveRiley); Date: Tue, 11 Sep 2001 22:06:02 -0400; Hi All New to the list, so can someone explane. I have a Henry 2kd classic desktop amp. I have a problem when I put in a new set of 3-500z and it want to take off.(osilating for give typing and spell; /archives//html/Amps/2001-09/msg00207.html (10,703 bytes)
48. [AMPS] SB-1000 mods? (score: 1): Author: Mike" <W4EF@dellroy.com (Mike); Date: Tue, 11 Sep 2001 21:09:53 -0700; Hmmm, if there are no good rules of thumb and no peak current/energy ratings for anode supply components, how does one go about sizing the glitch resistor? I guess you start out small and keep making; /archives//html/Amps/2001-09/msg00209.html (11,004 bytes)
49. [AMPS] SB-1000 mods? (score: 1): Author: 2@vc.net (2); Date: Wed, 12 Sep 2001 07:12:03 -0700; // The purpose of the glitch-R is to protect the electron tube from failure during an intermittent oscillation condition. For thoriated tungsten type tubes, the danger is to the wire filament/cathod; /archives//html/Amps/2001-09/msg00216.html (12,578 bytes)
50. [AMPS] SB-1000 mods? (score: 1): Author: 2@vc.net (2); Date: Wed, 12 Sep 2001 07:12:06 -0700; amp. // You should not do it if you are a good buddy of Mr. Rauch or Mr. Ehrhorn, and/or if you have a free supply of new tubes. // Jim Day does mods on Henry Radio amplifiers. One day when he was i; /archives//html/Amps/2001-09/msg00217.html (10,601 bytes)
51. [AMPS] SB-1000 mods? (score: 1): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Wed, 12 Sep 2001 16:27:13 +0100; Make that "...from failure due to a current surge occurring for *any* reason." It's best to keep an open mind about the causes, but by all means protect against the effects. 73 from Ian G3SEK Editor,; /archives//html/Amps/2001-09/msg00221.html (8,635 bytes)
52. [AMPS] SB-1000 mods? (score: 1): Author: 2@vc.net (2); Date: Wed, 12 Sep 2001 12:29:07 -0700; // Please name and explain some other causes of potentially fatal current surges, Mr. White. tnx - R. L. Measures, 805.386.3734, AG6K, www.vcnet.com/measures. end -- FAQ on WWW: http://www.contestin; /archives//html/Amps/2001-09/msg00222.html (8,230 bytes)
53. [AMPS] SB-1000 mods? (score: 1): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Wed, 12 Sep 2001 22:33:48 +0100; You appear to have forgotten that this very subject was discussed at some length back in January/February. Here are a few quotes from the literature. "Although a very high degree of insulation betwee; /archives//html/Amps/2001-09/msg00223.html (10,347 bytes)
54. [AMPS] SB-1000 mods? (score: 1): Author: 2@vc.net (2); Date: Wed, 12 Sep 2001 21:01:44 -0700; // Alzheimers? // What of G.W. Fyler (Sept.,1935) article in the IRE Journal - "Parasites in Transmitters"? // 22kV is X-ray-land, so at 22kV, perhaps. At 4kV, it seems unlikely because I have done; /archives//html/Amps/2001-09/msg00225.html (11,134 bytes)
55. [AMPS] SB-1000 mods? (score: 1): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Thu, 13 Sep 2001 11:06:38 +0100; Nah... you're just not changing your memory backup batteries often enough. Or maybe it's parasitic diodes in the I/O ports :-) We all know that parasitic oscillations can be a cause of current surges; /archives//html/Amps/2001-09/msg00226.html (9,381 bytes)
56. [AMPS] SB-1000 mods? (score: 1): Author: 2@vc.net (2); Date: Thu, 13 Sep 2001 06:27:02 -0700; // not quite, Ian. There's the person who professes that AC circuit-analysis is not valid for L-R parasitic suppressors. // But the "several" are not the cause of bent/broken filaments and gold-sput; /archives//html/Amps/2001-09/msg00227.html (9,585 bytes)

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