Marantz PM-50 is a stereo integrated amplifier, manufactured in 1989. The output power is rated at 105w at 4 ohms and 75w at 8 ohms. The frequency response is 10hz to 70khz. It comes with five input lines (PHONO, MM, MC, CD, TUNER, AUX 1, AUX 2) and two output lines ( SPEAKER 1 and 2). Specially, the dual mass capacitor of 15,000µF is used in the power supply section for stable current supply.