Kevin Hayes at VAC does not like any of the auto bias circuits out there. He says sound is compromised somewhat and that is why he does not have it.
Manual vs. Auto Bias
In considering new directions in which to take the evolution of my system, I have run into conflicting claims as to which results in less distortion...auto or manual biasing, according to what product(s) the so called expert manufactures and/or represents...(Surprise!) How about some input from average consumers like myself who have had more experience with one or both?