What would happen when you under Bias your tubes?


Hi, I am a tech noob and I always wanted to ask if it is safe to under biasing tubes and especially the power tubes? Will that affect performance or will that do damage to the amp? I am asking because my power amp which is the Lamm ML 2.1 has manual bias and when I left the bias unchecked for awhile. It somethings jumps much too high then originally set and those 6c33c doesn't last! I mainly set the bias to 70%. Is that OK? Thanks.
luna

Showing 1 response by russ69

I had to turn down the bias on one of my tube amps, it was going through tubes too fast. I didn't change it that much, around 10% I think. I could not notice a difference in sound.