I am guessing the 215 watt per side power amp is the ICEpower 200AS2 board. That should be 215w into 4 ohms at 1% THD (one channel driven, 150 for both), 120 watts into 8 ohms (1 or 2 channels), and somewhere around 60 in 16 ohms. The max continuous power without thermal shutdown is 85 watts combined, both channels.
So, if you use it with a 4 or 8 ohm cab, it should be pretty loud and hold together well at the output levels you would expect from a 50 watt tube amp, and if you are not hammering continuously, a bit more. That's pretty loud for most gigs this century.