Even if you have the correct output filament transformer, check the primary.
I have a few from the olden days of 115 line voltage.
4CX250’s want 6.000.
My 30L1 wants 115/230, not today’s 120/240 +.
There are Eimac papers that suggest running a percent or two below listed
number and cranking it up in a few years when power falls off.
Do a search.
Sent from my iPad
> On Oct 10, 2021, at 12:58, Jay Sturtevant <k2ztdx@gmail.com> wrote:
>
> You might want to check with an expert on this forum to make sure your
> filament supply is correct. I run a pair of 3cx800A7s and the
> designer/builder stressed correct filament voltage, if I remember
> correctly.
>
> Jay, K2ZT
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