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Total 4 documents matching your query.

1. [Amps] GU74B's (score: 1): Author: "Dave Hachadorian" <K6LL@ARRL.net>; Date: Mon, 24 Aug 2009 21:48:37 -0700; I have a commercial amp that uses a pair of GU74B's (4cx800a's). Due to a recent cable failure in the filament circuit, there was no filament voltage, but plate voltage, screen voltage and RF drive w; /archives//html/Amps/2009-08/msg00486.html (6,403 bytes)
2. Re: [Amps] GU74B's (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Tue, 25 Aug 2009 08:55:56 -0400; If nothing else is involved the tubes are fine since they werent powered up or emitting. Good luck. Carl KM1H _______________________________________________ Amps mailing list Amps@contesting.com htt; /archives//html/Amps/2009-08/msg00491.html (7,629 bytes)
3. Re: [Amps] GU74B's (score: 1): Author: "Bill, W6WRT" <dezrat1242@yahoo.com>; Date: Tue, 25 Aug 2009 08:30:58 -0700; ORIGINAL MESSAGE: REPLY: Yes, the tubes will be fine. Tubes can be damaged by operating them with the filament voltage on the low side, but with no filament V at all, no harm will be done. 73, Bill W; /archives//html/Amps/2009-08/msg00493.html (7,455 bytes)
4. [Amps] GU74B's (score: 1): Author: "Dave Hachadorian" <K6LL@ARRL.net>; Date: Thu, 27 Aug 2009 15:46:28 -0700; As several people predicted, my pair of GU74B's does not seem to have been damaged by accidentally running them without filament voltage. All is fixed now. Incidentally, this amp is a TenTec Titan II; /archives//html/Amps/2009-08/msg00559.html (7,435 bytes)

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