Does it raise the power output to go mono?
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G, paralleling the channels of a tubed* stereo poweramp creates a single channel with exactly the combined power into half the individually rated impedance. IOW, if you leave an MV60's output transformers' taps wired for 4 Ohms as they are at the factory and combine the channels, you have an amp capable of driving 110 Watts into 2 Ohms instead of the stereo amp's ability to drive 55 Watts into 4 Ohms per channel. ANY tubed amp does this; you merely wire the outputs in parallel--plus to plus and common to common--and drive the 2 inputs with identical signals. The easiest way to achieve the latter is with an inexpensive 1-female-to-2-males RCA adapter available at RadShak. Paralleling the channels effectively doubles the damping factor, too.
However, this is a quite-expensive way to get 2 110-Watt monoamps (or 50-Watt triode monoamps)...for about $7K. I'd be much more inclined to buy a pair of, say, ASL Hurricanes that'll give you 200 Watts per chassis in ultra(non)linear or 120 Watts in triode for $5K. I sure love the sound of my pair of 'Canes. Perhaps you should listen to both before committing your money.
* happens to SS amps, too.