That is there as both a parasitic damper and a fuse in case of a screen
short. Likely problem is a blown tube due to a tuning or antenna fault. OTOH
you may be lucky.
Carl
KM1H
----- Original Message -----
From: "Gary K9GS" <garyk9gs@wi.rr.com>
To: "AMPS Mailing List" <amps@contesting.com>
Sent: Sunday, May 13, 2012 3:10 PM
Subject: [Amps] Alpha 8100/GU74B Tetrode question
> Hello all,
>
> I have an Alpha 8100 with a pair of GU74B/4CX-800 Tetrodes. I recently
> had a problem occur with the amp going into a fault condition as soon as
> any drive was applied.
>
> Through some help from RF Concepts, I isolated the problem to an open
> series resistor that supplies screen voltage to the tubes. It's a 15
> ohm/1 W resistor.
>
> My question.....what would be the most likely cause for this resistor to
> fail open?
>
>
> --
>
>
> 73,
>
> Gary K9GS
>
> Greater Milwaukee DX Association: http://www.gmdxa.org
> Society of Midwest Contesters: http://www.w9smc.com
> CW Ops #1032 http://www.cwops.org
>
> ************************************************
>
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>
>
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