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In Reply to: RE: 300B - Is this thermal runaway ? posted by Tre' on October 26, 2021 at 08:51:16
No. Just the current project in a makeshift chassis.
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I would look for parasitic oscillation in the driver stage.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
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.
Yes, if the tube is healthy with about 340 volts across the tube and only 50 volts bias there should be some 240ma of plate current flowing. That would melt the plate.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
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