Autobiasing tube amp failure

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.

Good suggestions from all. Who can do the mods suggested?

Out of curiosity, who manufactures your amp?

To say that autobias is " no good ever" is hyperbole. I own 3 tube amplifiers, 2 are manual bias and one is autobias. All 3 are very fine amplifiers but the autobias amplifier is every bit as reliable (if not more so, 8.5  years of nearly daily use ) and the best sounding. No component or part is perfect and things occasionally need to be replaced or repaired, stuff happens. To universally denigrate autobias is silly in my opinion. Implementation as with all things involving audio is the overriding factor.
Charles

Charles, excellent comments above.