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Sansui AU-555A

Solid State Stereo Control Amplifier (1971-73)

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Sansui AU-555A


In design, appearance and performance, the amplifier draws heavily on the careful engineering that has made Sansui's larger AU amplifiers, favourites among stereo enthusiasts throughout the world.

The AU-555A is an upgraded model of the AU-555, featuring refined dull black panels and the exclusive triple tone controls.


Power output: 25 watts per channel into 8Ω (stereo)

Frequency response: 20Hz to 30kHz

Total harmonic distortion: 0.5%

Damping factor: 50

Input sensitivity: 2mV (MM), 180mV (DIN), 180mV (line)

Signal to noise ratio: 70dB (MM), 80dB (line)

Channel separation: 45dB (MM), 50dB (line)

Output: 180mV (line), 30mV (DIN)

Speaker load impedance: 4Ω to 16Ω

Semiconductors: 23 x transistors, 2 x diodes

Dimensions: 395 x 127 x 278mm

Weight: 8kg


schematic   English -

service manual   English -

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re: AU-555A

I just got one these recapped and refurbished. The sound is stunning! Highly recommended.

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