SS bias pot tweaks?

Points are very well taken, guys. I do agree you must be very careful but I'm just convinced by my own experience that the only way to pinpoint it is by listening. I've listened to lots of high-end stuff over the years but never heard the kind of sharp spatial positioning between instruments and vocals that I hear on my own stuff. Limitations in source material is simply apparent and not obtrusive or fatiguing. Ambient sound is so present that I can tell I'm hearing "all" of the information. I've been doing this for many years and have never blown an output or fried anything. Incidentally, I wonder if the self bias function in my Meridian 559 is why my other amps sound so much better?

I should mention that having said all that, I would definitely not attempt this procedure on an amp with multiple pots on each channel.

I'm aware of the overbias issue. However I was referring to channel balance. I discovered the bias pots in my Meridian 105's back in the late 70's and their significance to the overall performance of the amp. I'm no technician but confident enough to undertake such an adjustment. I've consulted a few techs regarding this and was assured the damage threshold is far past the degrees I've been turning them. I took my Bedini 100/100 in to have the bias adjusted once and found it had deteriorated the sound a little so I took the top off and simply "matched" one side to the other, barely moving the screw back and forth on one channel until it was "tuned in to the other side" while listening to music. The result was phenomenal. Heat is the killer here. Typically clockwise is the direction of least resistance, hence more heat. Many amps are "underbiased" for warranty purposes which serves to undermine their potential performance. Optimizing such an amp "speeds" it up, makes it noticeably more linear and deepens the sound stage. If you are not noticeably increasing the heat of the outputs your not doing any damage and just nudging the screw does not when your matching one side to the other. From my experience with doing this excercise it has become clear to me that using instruments to set bias merely ballparks it and then using your ears you can fine-tune it. The further off one side is from the other, the flatter more lifeless the sound will be to the point of no soundstage at all, just right and left channels. Transient response will also suffer practically in that the amp will sound "slower". You also will lose the ability to hear it's full frequency extension at both ends of the scale.