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That had to be their most popular chassis. Somewhere around here I have a book of factory service bulletins and recommended upgrades for the 20x1c38. Someday it will have a date with the scanner.
That chassis seems to be a bit harder on tubes and more sensitive to funky ones than most. It turns the 6KT8s black on the inside and the performance really goes wacky when they get weak.
Please try and hang on to it or find a good home. That is one solid built hand made piece of American art.
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