Quote:
Originally Posted by bgadow
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