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This is pretty much the conclusion I've come to. Even though there is two trim pots, they basically act as one. Since two different tube types are running off the same plate voltage there is no possible way to bias both pairs correctly. This bias mod is really kind of pointless. It doesn't...

A few months ago I bought a Mark III which had an adjustable bias already installed. This bias mod has two trim pots, but it appears to be just a balance. Each pot controls one EL34 and one 6L6, not pairs, unfortunately. I'd assume that it would need a seperate bias circuit to control pairs...

Thanks for the suggestions. I play everything from jazz to metal, so getting all three channels to do what I want is just going to take a lot of trial and error. I haven't had this amp very long, and I'm just starting to experiment with tubes. I'm shooting for good bedroom level tones. I...

Hello all. I’ve been doing a lot of preamp tube swapping in my Mark III the past few days. I found a couple combinations that I like parts of, but nothing that I like overall. I tried a RFT in V1, which drastically improved the R1 and R2. It made the clean channel very open and three...