[Amps] SB220 running plate current when no drive; Problem

[Rob Atkinson]

On Thu, Oct 8, 2020 at 11:01 AM <gudguyham at 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