I have a 1200s from the early 70's. It's a 4x6550 amp, reverb and tremolo. About 100 watts, and it weighs a ton. They are 'ultralinear' amps based on the Dynatone amps of the 60's. They are well bulit, all hand wired, except for a circuit board that has the 'effects' stuff on it. The amps are known for high, clean power. Mine originally came with a 6x12" , closed back speaker cab.