For Tube Amplifiers Auto bias No Good Ever , for it adds extra circuitry and resistors. It average each channel .
Manual bias far better you adjust each tube individually
And when a tube does go, just review the new tube, recheck others and done .it takes may be s minute per tube some compsnies still want you to use a meter way out dated., I had my own Simpson meters added and switch per channel ,seperste volt meter is primitive and s pain in the ass.
Manual bias far better you adjust each tube individually
And when a tube does go, just review the new tube, recheck others and done .it takes may be s minute per tube some compsnies still want you to use a meter way out dated., I had my own Simpson meters added and switch per channel ,seperste volt meter is primitive and s pain in the ass.