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I am strictly lo-fi so I don't know much about tube audio, but the 6SN7 & 12AU7 are desirable enough to audiophiles that I don't have any spares. Seem to be plenty of 6AU6s, though!
I have a similiar Philco and had to go through a half dozen 6SN7s in the vertical circuit before I found one that would work. The tubes checked okay, it was just that this set was very picky.
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Bryan
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