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Original Message
RE: Plate dissipation.
Posted by JKT on March 17, 2017 at 23:30:54:
"Of course, there's a point where this cannot be done anymore (limitation of bias circuit), and a new set of tubes is necessary"
By this time the space charge around the cathode will be depleted to the point where the tube is in serious danger of arcing. One of the challenges of trying to suck the last once of life from a set of output tubes. I know from experience. ;~)