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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...
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