hi, i just purchased a used swr head and i need a little help. it's a Professional Series "Studio 220." i think it's 500 watts cause it looks just like the new swr 500 watt amp. it also has the same controls and same face as the new 500 watt amp. it is just a couple of years older. someone told me it's only 350watts but i don't think so. i can run 2 4X10 fender cabs no problem. i can give you any more info you need i just don't know what to write now. thanks for any and all help.