seanrr
Well-Known Member
I recently got my first amps that have adjustable bias. They are Antique Sound Labs 1006-845 monoblocks that have had a bunch of mods done to them by previous owners. I have attached some photos, including one of the guts to show the cap replacements, etc. It has also been modded to be driven by 12SX7 tubes rather than 6NS7 tubes. Thus far, they sound very nice indeed, but I do have a question about bias. These have manual bias with digital readouts. As I understand it, the amps should play at about 800 on the meters. While I have them set close to that, the bias seems to bounce around a bit, sometimes going down to 789 or up to 810. Is that normal? Anything else I should know about the importance of the bias, etc.? I am not an engineer - so, bias for dummies would be preferable, and it is even better if there is anybody else with these amps who can tell me about their experience with the bias controls.