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My 19AP4 was a rebuilt tube with an October 1964 label on it. I therefore had hope that it was good.
When I got the set home and tested it with my BK467, there was absolutely no emission. I tried coaxing it back to life and the emission improved slightly but was miserably low. I then gave the tube a rejuvenation burst.
Lo and behold the emission came right up and is now excellent, even on life test. This was a few weeks ago and I tested it again and the emission remains excellent.
Consider that the tube has been sitting dorment for probably forty years. I think it just needs to be woken up.
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10-21-2011, 03:29 PM
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