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RE: 300B - Is this thermal runaway ?

As you have tried 3 different caps, that seems unlikely to be the problem. But the grid is being raised 275v above ground, and there must be a reason. Several candidate reasons (oscillation, open grid-ground resistor or connections, leaky coupling cap) have been covered in this thread, and rejected for reasons - it may be necessary to question those reasons more deeply. Or come up with another cause, such as a short from B+ to grid

I wouldn't worry about the low current draw until that issue is resolved.

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  • RE: 300B - Is this thermal runaway ? - Paul Joppa 16:59:33 10/29/21 (0)
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