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Sansui AU-555

Solid State Stereo Control Amplifier

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Sansui AU-555

Description

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.

Specifications

  • Power output: 20 watts per channel into 8Ω (stereo)

    Frequency response: 20Hz to 50kHz

    Total harmonic distortion: 0.5%

    Damping factor: 12

    Input sensitivity: 3.5mV (mic), 2mV (MM), 200mV (line)

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

    Output: 140mV (line)

    Speaker load impedance: 4Ω to 16Ω

    Semiconductors: 22 x transistors, 6 x diodes, 4 x thermistors, 1 x SCR

    Dimensions: 15 x 4-3/8 x 10-7/8 inches

    Weight: 17.4lbs

  • 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

Downloads

A schematic  English

A service manual  English

operating instructions/service manual  English - Biro

schematic  English - Biro

schematic (imp scan)  English - Paul Edman

operating instructions/service manual (imp scan)  English - Ivy Caudieus

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Comments

re: AU-555

I have had the A version of this amp for many years and it has great sound. I like the tone controls.
It has been very reliable also.

This website is not affiliated with or sponsored by Sansui. To purchase AU-555 spares or accessories, please contact the company via their website or visit an authorised retailer.