If current is drawn from the cathode when the filament
voltage is too low it will strip the cathode.
Mark WB8JKR
On Wed, 20 Jan 1999 08:24:07 -0500 "pmarkham" <pmarkham@newsguy.com>
writes:
>
>
>
>>Actual numerical voltage value is not that important, I just turned
>it down
>>to where power output dropped off and went back up about .1 or .2
>volts
>>(reading secondard voltage).
>
>? This is the right way to adj. the fil. potential for a thoriated
>tungsten cathode. One really doesn't need an accurate fil. voltmeter.
>
>Howeven, this method can destroy heater/oxide-cathode type tubes.
>
>Can? By what mechanism, if the designed filament voltage is not
>exceeded?
>
> TIA, Pete/wa4hei
>
>
> The meek will not inherit the Earth.
>
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>
>
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