Hoffman Amplifiers Tube Amplifier Forum
Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: EddyMunster on October 24, 2025, 10:08:09 am
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I am new to this forum so hello to everyone.
I have poked around the web for an answer to this question with no luck.
I have two Carvin Legacy 3 amplifier heads and I am getting the same results from both.
I set the bias to 100ma across the bypass switch per Carvin's method on both amps.
I did a comparison and noticed the power tubes are only running about 8ma per tube. I measured the 8ma using a bias probe at each tube socket.
I'm thinking they should be reading closer to 20ma per tube.
Is anyone familiar with these particular amps or has anyone seen this with Legacy amps?
I attached a schematic and I'm not very savvy with schematics for amps.
-Eddy