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Ahem
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I did it as well. I even had a thread here showing the schematic and everything but it's lost to time. I basically copied a Kenwood bias schematic.
Seem to remember reading somewhere that one of these two amplifiers that used the 3-400 that you could not slap a 3-500 in. It was something about the chimney height and the height to the top of the case or something. You couldn't put the taller tube in. Does anybody remember exactly the case...
Somebody had mentioned there was a particular amplifier project in that issue that would Interest me but I can only assume it was likely a multi band 3-500z amp... If it was I don't care. If it was more exotic though
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Speaking of filament chokes, not that this is my thread, but on the same vein of thought... I learned the coupling effect to the chassis the hard way. I pretty much suspend every filament choke now just off the surface of the deck. However you can do it is useful...in tube amps of course.
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