NAD 3155 Amplifier 
All serviced - excellent performer 

Specifications
Power output: 55 watts per channel into 8Ω (stereo)
Frequency response: 20Hz to 20kHz
Total harmonic distortion: 0.04%
Damping factor: 50
Input sensitivity: 0.28mV (MC), 2.8mV (MM), 25mV (line)
Signal to noise ratio: 78dB (MC), 78dB (MM), 86dB (line)
Speaker load impedance: 4Ω (minimum)
Dimensions: 420 x 108 x 380mm
Weight: 8.4kg
Year: 1985