> > Is there any easy way to tell if the tubes are shot?
> Put his tubes in your amp.
If the tubes are shorted or gassy, that may be a problem for his good amp.
Some Ten Tecs (maybe all?) don't have grid current trip circuits,
and can eat up a set of tubes pretty fast if the grid current isn't
> > Can the amp be run with just one tube at a time to test each tube?
73, Tom W8JI
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