Mcintosh mc-601 or 1201 ?


I want to buy one new amplifier for my system, i have a mcintosh mc-601 monofónic amplifiers, the mcintosh mc-1201 mono amplifiers is a upgrade over 601?, is 1201 better than 601?
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I believe the difference is not just watts... But I believe the 601 is quad balanced while the 1201 is not.
i've read many years ago that to get a 3db increase in volume you would need to triple your current power. i remember reading this in the old "stereo review" magazine