Tube amp bias adjustment advice

Not sure why my link to pictures disappeared. Here it is again:

https://systems.audiogon.com/systems/6261

mmporsche OP
Not sure why my link to pictures disappeared. Here it is again:

I assumed you had 211 monoblocks in my first post, now I see it’s a stereo, but same deal.
Don’t play with the bias yet, just swap left for right speaker leads and interconnects on the amp (this way the recording is still the same orientation) and see if the balance still favors the left.

Cheers George

OK, have your girlfriend sit dead center, and you sit to her right!

The balance control of many otherwise fine preamps and integrated amps have disappeared over the years. It is simply a cost cutting move as there is no reason that a balance control has to compromise SQ. I would not have a preamp without one.

There are many reasons a balance control may be useful as were detailed here.  An additional factor is that some recordings need a balance control to place the soundstage correctly.

IF you do testing be sure to use a tone generator so the exact same level and tone go to each speaker. That should tell you if there really is a difference in gain between the two channels. Then you need to take the necessary steps to isolate where the gain difference is located, it may be a cable, in the preamp, or as you originally suspected in the power amp. But doing an overall gain measurement at like 1 khz one foot from the speaker with a sound level meter at each speaker will tell you beyond any doubt if there is a level difference.