ORIGINAL MESSAGE:
On Mon, 24 Aug 2009 21:48:37 -0700, "Dave Hachadorian" <K6LL@ARRL.net> wrote:
>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 were applied. After I get the
>filament cable problem fixed, can I expect the tubes to have
>survived?
>
>
>Dave Hachadorian, K6LL
>Yuma, AZ
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 W6WRT
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