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Re: 6as7 life continued...

If you knew enough to measure the current through your tube sections ("50 to 80mA"), then perhaps we can talk you through checking the input stage. Obviously there is some danger involved due to proximity to high voltages, but if you keep one hand in your pocket at all times while taking measurements and do nothing else silly, then you would be OK, if you have a VOM. First, is the "problem" identical in both amplifiers? Have you checked out your preamp and/or other front end gear to be certain that nothing is wrong with them?

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