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Original Message
RE: 300B - Is this thermal runaway ?
Posted by Burney on October 27, 2021 at 00:24:10:
Thanks. I installed range of stopper resistors from 220R upto 10k. Both at the driver and the 300B. No improvement
Secondly, as I understand the grid voltage at idle should be much higher than -50vdc that I am measuring right now.