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  #16  
Old 03-27-2015, 12:12 PM
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jr_tech jr_tech is offline
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Quote:
Originally Posted by bgadow View Post
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

Last edited by jr_tech; 03-27-2015 at 12:22 PM. Reason: correction
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  #17  
Old 03-27-2015, 01:28 PM
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Phil Nelson Phil Nelson is offline
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Quote:
Originally Posted by Tubejunke View Post
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.

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