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 failure mode.
Take note of the parts involved and consider ordering spares. They're not
expensive. If your 9500 is an early model and the bias supply isn't
fuse-protected, it should be.
Paul, W9AC
-----Original Message-----
From: Amps [mailto:amps-bounces@contesting.com] On Behalf Of Bill Turner
Sent: Monday, October 31, 2016 11:38 AM
To: Amps group <amps@contesting.com>
Subject: Re: [Amps] ALPHA 9500 Question (Fault 21)
------------ ORIGINAL MESSAGE ------------(may be snipped)
On Fri, 28 Oct 2016 15:46:16 -0700, David wrote:
>
>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 not shorted.
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 9500 was under warranty and Alpha repaired it at no charge,
not even for shipping.
73, Bill W6WRT
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