What single channel are you intending?
Just to clarify what I found:
120 wpc x 6 at 4 ohms; 80 wpc x 6 at 8 ohms
"CONFIGURABLE POWER OUTPUT. Channels 1/2, 3/4, and 5/6 can be operated either in the normal mode (120W x 6) or with each channel pair independently bridged (275W x 3). Configurations of 5 and 4 channels are also possible."
http://www.berners.ch/McIntosh/Downloads/MC126_bro.pdf
no mention of bridged MONO or 360 wpc. Perhaps they mention it in the full manual
http://www.berners.ch/McIntosh/Downloads/MC126_own.pdf
mixed review
https://community.klipsch.com/index.php?/topic/9138-opinion-on-mcintosh-mc126-6/
seems they only made it a few years: 2001-2003
might be hard to find parts if needed.