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Working on a totally dead K7400. No clicking, only a degauss sound when on a tube.

HOT is ok. Trying the lightbulb test now, getting no light and I'm getting -80VDC on the B+. Yes, negative. The B+ adjustment pot has been bypassed by a 1k resistor (by someone else) and it was working this way on location for months of not years.

I'm not particularly familiar with the K7400 so I'm wondering if anyone has come across this very odd situation.