Hoffman Amplifiers Tube Amplifier Forum
Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: plexi50 on May 16, 2012, 06:21:54 pm
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Gladly i dont have any of these amps coming in latley. But i am still curious about the VPR power reduction button on the front panel and how the circuit works. I had a TSL 2000 amp 5 months ago and the bias would run away if Con 12 was plugged in on the main board and also connected on the VPR board of Con 20
If Con 20 on the VPR board was unplugged the bias was perfect and the amp bias was stable and good. Plug in Con 20 and the bias would run all over the place