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One interesting thing happened, the vertical output tube died, I shut it off to do something and when I turned it back on no vertical, the amp meter I have in line with the Variac was showing almost an amp of current and one heater in the tube was glowing much brighter than normal.
I found another 6CM7 and was back in business.
I had been running the set with the Variac cranked up higher than normal trying to bring the B+ up a bit, (the Selenium rectifiers may be getting weak), possibly the extra voltage killed an already marginal (original Silvertone) tube.
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