Wiil,
For years it was and is common practice to outgas tubes by applying HV at low
current i.e. one or two ma. till the tube arcs. Then reduce the HV a tad till
the tube stops arcing. Leave the HV at this value for 30 minutes or so. Then
raise the HV slightly.
Also try to run the tube at reduced HV and a heavy load. Get it as hot as
possible. Then reduce the current to 1 or 2 ma. and raise the HV. This is a
long process. BE certain to use a current limited supply.
When you can hold off 20 to 30% more than rated HV your finished!
George
W4IW
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