>
>
>I just obtained a Henry 2K-3 that has been in storage for about 5 years.
>I also vaguely recall that you should apply filament voltage without
>the high voltage to 'cook' the tubes if they have not been in service
>for awhile.
>The tubes are a pair of 3-500Z's. Anyone have any thoughts on how long
>I should cook them before I apply the high voltage?
In the technical specification sheets for the 3-500Z, neither Eimac nor
Amperex provide no such advice. I test old tubes first with a high-pot.
set for 8kV. If there's a blue glow inside, the tube is gassy and it is
virtually certain to damage an amplifier.
Rich---
R. L. Measures, 805-386-3734, AG6K
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