Dirk...the MC402 specs can be found here: http://www.mcintoshlabs.com/products/mcintosh-mc402-stereo-power-amplifier.asp
If the VTL 5.5's output impedance is 195 ohms and the input impedance of the MC402s is 10Kohms (single ended) and 20Kohms (balanced), then there should be no impedance mismatch between the units. You want at least 10X input impedance of power amp to output impedance of pre. In this case you get 50x+. So you should be ok. The specs do not specify gain but you should be able to get that by calling up McIntosh. I have no experience with the amp so don't know its sonic attributes but purely on paper from an impedance matching point of view, that combo should work.
If the VTL 5.5's output impedance is 195 ohms and the input impedance of the MC402s is 10Kohms (single ended) and 20Kohms (balanced), then there should be no impedance mismatch between the units. You want at least 10X input impedance of power amp to output impedance of pre. In this case you get 50x+. So you should be ok. The specs do not specify gain but you should be able to get that by calling up McIntosh. I have no experience with the amp so don't know its sonic attributes but purely on paper from an impedance matching point of view, that combo should work.