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Hitachi HA-5700

Integrated Stereo Amplifier (1979-81)

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Hitachi HA-5700


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

Frequency response: 10Hz to 100kHz

Total harmonic distortion: 0.02%

Damping factor: 50

Input sensitivity: 0.25mV (MC), 2.5mV (MM), 150mV (line)

Signal to noise ratio: 60dB (MC), 80dB (MM), 100dB (line)

Output: 150mV (line), 40mV (DIN)

Semiconductors: 7 x IC, 17 x transistors, 4 x FET, 66 x diodes

Dimensions: 435 x 110 x 380mm

Weight: 10.8kg

Year: 1979


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Hitachi KA-5700 Protection circuit

The Protection Circuit getting increasingly intermittent.
Thanks to the manual here, traced to diode D901 open circuit.
Replaced with 1N4002. Now works!

Don't know how old this amplifier is - must be early 80's but was still set-up perfectly. No drift on DC balance or quiescent current. Still sounds dam good too!

Only thing not 100% - the speaker switch is broken.

Recommend this amplifier. Well made. 5 stars!

Thanks to hifiengine.

This website is not affiliated with or sponsored by Hitachi. To purchase HA-5700 spares or accessories, please contact the company via their website or visit an authorised retailer.