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now you have another roundie!! i envy you. my 15 had vertical issues too. centering pot was gone and it had a double resistor set up to the linearity control that caused the top to expand - created coneheads! i cut out both resistors and cured that problem. then the service switch went up in smoke! it is on the back burner now. i will get to it someday. those vertical circuits in those old tubers. i need to learn more.
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