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I don't get it really, because the neck diameter and socket footprint is the same for a 1947 10BP4 as it would be for a 1956 21ZP4 or my 1958 24AJP4. I can understand the problem with high voltage arching. Perhaps there was a procedure or special connector to control second anode input to the tube. Anyway, if anyone spots one that is suitable for my 24AJP4, please drop me a line. Thanks!
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