> On Aug 1, 2020, at 12:40, dbritchie@gmail.com wrote:
>
> Hi Mike!
> Yes - in my experience that is about what you can expect from a used
> SB220/221.
Those amps, it’s power supply and tank circuit were designed when the rule was
1 KW input, and get 600 out.
With the 2400 or so volts on the plate and not the 3500 of a Henry or
Ameritron, all you are doing is smoking the grids
and causing splatter over half the band.
My home-brew, with grids grounded, 3600 v, does 1500 out with 70 w of drive,
and 150 mils of grid current.
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