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Curious if anyone has ever used either a 12DQ7 or 12BV7 in place of the 12BY7 in a T4XC?? I have to search through my thousands of tubes and while I will primarily be looking for a 12BY7 I was just wondering if the other two would work. Characteristics seems very similar, and of course pin out is the same.
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Doug, WA3DSP

I think I have answered my own question. These tubes are basically one and the same. I found quite a few in my stash, and this RCA is numbered with all three types. I ended up using a JAN GE 12BY7A which worked fine.
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Doug, WA3DSP

BTW a 12GN7 while not a direct substitute has the same pinout and is about twice the plate dissipation and higher transconductance than the 12BY7. I could not find one to try but it would be an interesting to try if you could find one. It would definitely require retuning.
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Doug, WA3DSP