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OK, so last evening I went thru and replaced the 7F7 tubes as well as the 12AU7 tubes. No difference. So I'm back to focusing on the resistors. Over the next day or two I'll be going thru and checking all of them and replacing any more than 10% out of spec, and if that doesn't find the issue, I'll go in with the freeze spray next.
I am, of course, presuming and assuming that Philco would never have put a circuit into production that passed such poor linearity....... !!!!
-George-
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