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Thanks so much for the help!
Changing the socket wiring and the heater voltage doesn't seem too bad. However, circuit mods sounds a little more complex. Considering the difficulty (and I'm guessing cost) in finding a NOS original tube it seems worthwhile. What kind of circuit mods are you talking about, N2IXK?
I do see some posts by banderson on this forum about using the 21AFP4. Sorry to be pushing, but if this tube will work I'd like to jump on it before it goes away.
Jonathan
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