Supro thunderbolt plus in good used condition. All valve 1x15 combo.. im guessing you will probably know a little about this amp if you are looking at this, but this model has the power selector (rectifier) switch. 30W which is the original thunderbolt or 45W, 60W. for different tonal character. it has a fantastic natural overdrive when you crank it up, which is what these amps are meant for.. sounds great, and looks very stylish. lovely sparkle to the grill cloth which doesn't come across in the photos and beautiful blue tolex. it's a cool amp. recently serviced with two brand new output valves. (JJs) a few scuffs to the corners but in otherwise good clean condition.