Re: dumping a lot of heat

john larkin <JL@gct.com> wrote:

Yup. EF91 is known as "Not the valve that won the war."

That's because it wasn't available until 1947.     :-)

One could make an optocoupled tube half-bridge, or full-bridge, with
maybe a 30 KV supply. I guess you'd use batteries for filament power.

Not necessarily.  The Cockroft-Walton multipliers made by Philips, for
generating high-energy X-rays, superimposed RF on the capacitor chain
and derived the heater current from that.  (It's somewhere in the
Philips Technical Review but I can't remember where.)


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~ Liz Tuddenham ~
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