I wish that I still had the Polytone 102 that I used for almost 20 years. Great fidelity with twin 12"s. Never should have sold it. That said, on solo gigs, I use a Behringer KX1200 keyboard amp with a 15", an 8", and a horn. No problems during the 4 years I've had it. No hum, hiss, or odd sounds. On duo gigs with my wife on guitar, we run everything through a Behringer 1622 mixer into a Crown head and 4 Behringer cabinets (2-e1220 and 2-B212). Behringer is getting the same bad rap that Peavey got when his amps started popping up in the late 1960's. Fender and Gibson dealers all said they were trash. And from my experience, any brand of electronic equipment can have unexpected problems. That's why it's good to purchase new with a warranty.