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1. [Amps] ALPHA 9500 Question (Fault 21) (score: 1): Author: "David B. Ritchie" <dbritchie@gmail.com>; Date: Fri, 28 Oct 2016 15:46:16 -0700; Hello - I am getting Fault 21 on my Alpha 9500. The Fault Decoder Sheet from their website says it has to do with the Cathode +40V bias PS. It suggests that it might be a shorted tube. The tube is no; /archives//html/Amps/2016-10/msg00138.html (7,723 bytes)
2. Re: [Amps] ALPHA 9500 Question (Fault 21) (score: 1): Author: Bill Turner <dezrat@outlook.com>; Date: Mon, 31 Oct 2016 15:38:13 +0000; -- ORIGINAL MESSAGE --(may be snipped) REPLY: I had a 9500 where the tube arced and blew out the 40 VDC supply. Your tube may not be shorted now but I suspect it arced at one time. Fortunately my 950; /archives//html/Amps/2016-10/msg00156.html (7,623 bytes)
3. Re: [Amps] ALPHA 9500 Question (Fault 21) (score: 1): Author: "Paul Christensen" <w9ac@arrl.net>; Date: Mon, 31 Oct 2016 16:39:33 -0400; This may be of some help: http://lists.contesting.com/_amps/2015-09/msg00039.html In our case, Ig read excessively high with no RF drive although I'm not sure if that's always symptomatic in this fai; /archives//html/Amps/2016-11/msg00004.html (8,468 bytes)

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