Monster modern bass combo with built in tuner,distortion and octave. has the same fault as nearly every other BT220 which is suffers volume drop every now and then. Most google searches say easily fixed by replacing one transistor. I've gigged with it no problems,only ever did it once in the house. Anyway,100 for a cheap sale..need the space.8-) Made by Ampeg just before they changed the name of all their combo's to Ampeg. Ronz