>
>
>
>>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?
>
? By the application of too low a heater potential - which can result in
separation of the barium-strontium oxide layer from the cathode.
Rich...
R. L. Measures, 805-386-3734, AG6K, www.vcnet.com/measures
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