Don't write off the Sumo yet. A friend faced similar problems with an old Electrocompaniet. The output transistors which were bolted with two screws each on the heatsinks were no longer available. But a crafty repairman found the corresponding new transistors (albeit with smaller dimentions), drilled holes on the heatsink to screw on the new devices, and the unit is now fine.
Blowen Amp, Looking for replacement, any thoughts
This past weeked I fried the right channel on my Sumo Polaris amp. Sumo is no longer around and the mosfet transistors are also discontinued. I don't have any way of crossreferencing the parts so a repair is unlikly. If you have info please foward. So this brings me to replacing my amp. I am planing to continue using the Sumo Athena pre-amp and ADS L1290 speakers I have for a while but would like some suggestions on power amps in the 1000.00-2000.00 range. I have a friend that uses an audio research D110b. I have found one at this site and am considering that unit unless someone can give me a good reason not to. Thanks DaveL.