black knight
Active Member
- Joined
- Sep 17, 2014
- Messages
- 81
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The static sound in the decay of some chords is caused by cold bias, usually.
Yes the bias was cold. 468 plate volts, 25.7 mA. Shooting for 37 mA, The bias pot maxed out at 30.7. Also, I could hear a sort of helicopter sound through the speakers when the volume is turned up. I've never noticed this when biasing. And I did not notice it when playing the amp. Is this DC ripple?