In Reply to: RE: These here tubes can be tricky little buggers! posted by vinnie2 on September 28, 2016 at 03:26:25:
The grid n the bad tube is miss-aligned which is causing the bias problems. The grid could be way too close to the filament and be coupling with it. But take any DHT and go way past the current ratings for it and it will likely hum, kind of like the scream of torture.
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Follow Ups
- RE: These here tubes can be tricky little buggers! - Chip647 04:42:21 09/28/16 (1)
- RE: These here tubes can be tricky little buggers! - vinnie2 05:46:05 09/28/16 (0)