Quote:
Originally Posted by Robert Grant
I say this, because I wonder if a test of an unknown CRT should start with a very low voltage continuity test of the filament, then, if there is any conductivity, doing some type of test for any presence of air in the tube.
Rather than just hooking up the tester, which would destroy the gun of the tube if in fact the tube had gone to air?
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When I first powered up my 22EP22 after sitting for 15+ years, I did just that, and brought the heater voltage up slowly. I did NOT want to see a flash from the heater that would indicate that I had destroyed the tube!
I was fortunate, the heaters appeared to power up normally. Had they not, I really had no game plan, and I doubt that the tube could have been saved anyway... Perhaps long term low voltage on the heaters would "pump" the tube somewhat... perhaps the getters could be "re-flashed"... but at least the heaters would be intact for further experiments.
jr