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It's holding up so well that I have gone on to the next project. Miss America plays all day long to entertain me in the shop until we decide where to put the set.
The linearity is just bad enough to be annoying. I have replaced practically every resistor in the vertical section, even the two on pins 9-10-11 of the yoke socket.
Swapping tubes is a good idea. I tried subbing the 12AU7 but don't have a 6CM6 (vertical out) on hand. I went on a treasure hunt and found many odd & wonderful tubes -- why do I have two dozen 6BH6s? -- but no 6CM6 or equivalent. May as well order one.
I was a little disappointed in the bass response and even thought of hotwiring a new tone control. Then I put the back cover on and, duh, the bass sounds fine.
Phil Nelson
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