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- - Does this mean my 21AXP tube has gone to AIR??? (http://www.videokarma.org/showthread.php?t=263831)

Quote:

Originally Posted by bgadow (Post 3129826)

I had a 21FJP22 that had worked fine. After years of storage I tried testing it one day and got similar results. After looking carefully I could see just a dim glow from the filaments, before watching them burn out one by one. A sad thing to watch :(

Yep! I observed the same thing on a 15GP22 when I pulled my CT-100 out of storage... indeed, very sad to watch.
I suspect that the OP did not experience burnout because the heater voltage output of his tester sagged down under the higher load of nearly cold heater ... Like mm82 indicated, a good solid 6.3 volt transformer supply would probably burn out the heaters fairly quickly.

jr

Quote:

Originally Posted by Tubejunke (Post 3129680)

I meant it as a general thought on the thread and the info. we had at the time.

It's a reasonable question, and I had wondered, too, why my filament didn't burn out right away. Maybe jr_tech's idea is correct -- the tester's supply was bogged down.

Phil Nelson