Denon PMA-501 Stereo Amplifier

Power output: 50 watts per channel into 8Ω (stereo)

Frequency response: 5Hz to 100kHz

Total harmonic distortion: 0.05%

Input sensitivity: 2.5mV (MM), 150mV (line)

Signal to noise ratio: 76dB (MM), 100dB (line)

Output: 150mV (line), 1V (Pre out)

Speaker load impedance: 4Ω (minimum)

Dimensions: 430 x 146 x 321mm

Weight: 13kg

Year: 1978