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FIXED, AND i AM AN IDIOT
after consulting with some folks over at fun with tubes, I check the line voltage AT THE CHASSIS, turns out it was low, I still had the set on the variac and thought I had 117v at the chassis, wrong, voltage drop across the line/switch must have been doing me in.
The orig problem of under scan was prob fixed when I replaced the osc driver tube, as this improved the scan width, but by then I had the set on the variac.
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