This 15W combo with one 10″ speaker is based on the blackface Princeton Reverb. A pair of 6V6 output tubes produce nice clean tones at lower volumes and breaks up and growls nicely when turned up. Features a full size spring reverb tank like the larger combos and deep bias modulated vibrato for a lush 3D like effect. The one pictured features a 12″ speaker for more volume and fullness. Can be upgraded to a + model with a bigger output transformer and pair of 6L6GC power tubes producing about 22W of portable power and tone.