TEAC BX500 Amplifier
Rebuilt power stage. 
 
Specifications
Power output: 55 watts per channel into 8Ω (stereo)
Frequency response: 10Hz to 30kHz
Total harmonic distortion: 0.1%
Damping factor: 50
Input sensitivity: 0.5mV (MC), 2.5mV (MM), 150mV (line)
Channel separation: 42dB (line)
Output: 150mV (line)
Speaker load impedance: 4Ω to 16Ω
Dimensions: 410 x 140 x 272mm
Weight: 8.5kg
Year: 1979