Solved by trying :) Hint: Volume knob has to be set to 0 otherwise procedure not works (at least for me). But bias adjustment knobs really work in opposite direction.
Hello all! Recently bought this amp, it has yellow led inside I suspect it's old model. However, when trying to check and adjust bias according to manual (2 bias adjustment knobs) something looks really strange.
Right knob not responding at all, doesn't matter which tube is being checked. Left...
Hello, I recently bought Marshall and Captor 16 Ohm. Tested head with cab - everything good, sound as it has to be.
To be short, I connected everything as it should be according to manual, impedance good, tubes good cables good, installed Wall of sounds. And sound was just awful... At low gain...