Picky, picky. I also use both new and old Sunns interchangeably. The only differences I CAN HEAR are 4 x 12 Celestions versus the old JBLS, most of which I replaced with EVM 400 watt Black Shadows a long time ago, and some tone difference between my old Model T----THE REAL ONE----and my new one, which isn't half bad. True, is it not a non reverb 100s but nothing else ever will be including an old Model T. The NEW/FAKE/ SUNN/FENDER 300T is top notch, but that is not to say that the best bass head ever made, the Colesium LEAD, (you read right, lead, not bass) is any less than it always has been. By the way, I have played guitar since 1965 and the best guitar (yes, not bass) rig I have found is a new Sunn 300T head with two Sunn N1200(crossover) bottoms with EMV Black Shadows. You can destroy buildings with that rig. The same bottoms with the Colesium Lead plus an ADA preamp or Hughes and Kettner half rack Blues Machine also cranks just fine.