STK 442-130 intergated circuit.
Dual power audio amplifier 2x150W Supply Voltage Min: ±41V Max: ±64V, Icc 0: 60mA, Iout max.: - Pout max: 2x150W, Load Resistance: 6Ohm, Bandwidth: 20Hz-50KHz, Input Resistance: 55kOhm, THD: 0.2%, Gain: 30dB. Fits on Peavey, Genelec.