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the known-good tube (out of a working set) used a different socket adapter, but I've also tried the tester on two 17BP4s from other sets I've yet to restore (a Majestic 70 and a Bendix C172U) that use the same socket (#1) as the 21ZP4 and they both show good emission and cutoff
same bias setting as well
also, I think I should mention before anyone asks, I have tried touching up all of the pins with a soldering iron with no improvement
Last edited by cluelessgame; 08-06-2016 at 01:42 AM.
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