If you view the schematic for the power amp, you won't see a single chip amp like a TDA series found in cheaper practice amps. Instead, you see a "Discrete Solid State" push-pull design.
: Unlike many guitar amps, the JC-120 uses a solid-state, true stereo power section . The schematic identifies two separate power amplifier circuits (one for each 12-inch speaker), typically delivering 60W per side. jc-120 schematic