[AMPS] Adjusting fil voltage

[Rich Measures]

>
>
>
>>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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