Steve wrote:
> Does anyone know if there are problems using high frequency (say 30kHz)
> ac to run the heater in a valve with a cathode? For that matter, the
> filament in a valve without a cathode?
If line-frequency (50 Hz or 60 Hz) power can cause a small amount of
modulation of the RF output, then I would think 30 kHz could do the
same thing. The output signal would then have sidebands at +/-
30 kHz from carrier, down maybe 40 or 50 dB. I suspect this
would be an issue mostly with directly-heated cathodes.
- Jim WB6BLD
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