My Concert PA model 1 has the same power section as the Concert Bass...i.e. it has 5 power transistors on the back plane
It says its a 150 watts RMS but who knows for sure.....this is the model with 6 XLR mic channels and reverb and master EQ section...its kinda clunky in size but then I like that old spring reverb a lot
there's also a 6 channel Concert Model 2 with Phone connectors and another Concert model that looks like an amp head with 4 (?) channels - I don't know about those