A word to the wise, they are very heavy relative to rack SS amps, and they are cumbersome to move and gig with. I have to make special trips from the car to the stage with it for instance. It does get old to do that, but still worth it to get the tone. My Mc50 was ideal for most of the places I play, but it did begin to have issues moving it about so much 2-3 times a week, it took a tumble off a dolly, not even a foot fall. if those amps fall, its a lot of weight to damage something in those 40 year old amps. That is my only issue, again I still think its worth it for the tone. I just wish I could, (which I could if I took the time), put it into a chassis and rack mount it.
Plus, if I ever had to change amps on the fly, the wires hook up around screw terminals while all my backup amps are 1/4 inch outs. Again something that could be remedied with some novel modifications... It is my secrete weapon tone wise, no other amp I have sounds as nice and harmonic in conjunction with the Twins preamp.