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1. [Amps] SB-1000 160 m power down (score: 1): Author: "Han Higasa" <higasa@plum.ocn.ne.jp>; Date: Thu, 15 Dec 2011 12:16:03 +0900; hi gents, Recently I was asked to repair a Heathkit SB-1000 amp from a local friend. At first the Eimac 3-500Z installed was arcing pink like stabilo instead of orange. For many hours I have baked th; /archives//html/Amps/2011-12/msg00116.html (7,882 bytes)
2. Re: [Amps] SB-1000 160 m power down (score: 1): Author: TexasRF@aol.com; Date: Fri, 16 Dec 2011 19:57:33 -0500 (EST); Hi Han, it seems something in the output circuit is changing value. The most likely part is in the plate loading circuit as that is where maximum rf current flows. Many amplifiers switch in extra cap; /archives//html/Amps/2011-12/msg00127.html (9,569 bytes)
3. Re: [Amps] SB-1000 160 m power down (score: 1): Author: "Han Higasa" <higasa@plum.ocn.ne.jp>; Date: Sat, 17 Dec 2011 10:44:05 +0900; Thank you Mike. The input SWR, Ip and Ig seemed OK on all the time. Also thank you Gerald K5GW Until last evening I tried: 1. exchange two 170 pF and one 500 pF adding caps with another set of simila; /archives//html/Amps/2011-12/msg00128.html (8,524 bytes)
4. Re: [Amps] SB-1000 160 m power down (score: 1): Author: "Han Higasa" <higasa@plum.ocn.ne.jp>; Date: Thu, 22 Dec 2011 15:27:27 +0900; Thanks to all the people who have gave me advice the 160 m power-down problems have been solved. The cause was the second filter resonance. I have added a second B+ filter at the cold-end of the plat; /archives//html/Amps/2011-12/msg00188.html (8,134 bytes)
5. Re: [Amps] SB-1000 160 m power down (score: 1): Author: Vic Rosenthal <k2vco.vic@gmail.com>; Date: Thu, 22 Dec 2011 09:56:55 -0800; Very interesting. Evidence that you always need to measure inductance of toroids at the operating frequency. Vic _______________________________________________ Amps mailing list Amps@contesting.com; /archives//html/Amps/2011-12/msg00192.html (9,126 bytes)

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