On Thu, Oct 8, 2020 at 11:01 AM <gudguyham@aol.com> wrote:
>
> 3-500 tubes with directly heated cathodes, unlike tubes like 8877 and
> 3cx800’s etc do not have fragile grids nor does reasonable peak grid current
> have cumulative degrading effects on the grid. Because the grid is robust a
> ICAS rating can rise to damn close to 1kw pep output.
You can go ahead and beat on a single 3-500 like that every day and I
guarantee you'll be getting a new one in around 5 years. Especially
if you operate high duty cycle or with a lot of compression.
73
Rob
K5UJ
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