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Yamaha AX-870

Natural Sound Stereo Integrated Amplifier (1993-95)

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Yamaha AX-870


Power output: 110 watts per channel into 8Ω (stereo)

Frequency response: 20Hz to 20kHz

Total harmonic distortion: 0.008%

Damping factor: 320

Input sensitivity: 0.16mV (MC), 2.5mV (MM), 150mV (line)

Signal to noise ratio: 75dB (MC), 92dB (MM), 110dB (line)

Channel separation: 55dB (MM), 50dB (line)

Output: 150mV (line), 1V (Pre out)

Dimensions: 435 x 171 x 448mm

Weight: 14kg

Accessories: remote control transmitter


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AX-870 main PCB

The main PCB which includes the power amplifier along with 2 separate DC converters for the power amplifier itself and for the pre-amp PCBs is exactly the same as in AX-890, except a minor difference of the shape of the speaker binding terminals and a different power-on delay relay, which just comes from a different supplier, but functionally wise is the same. So this main PCB can be easily swapped between these two types.
The pre-amp circuitry of AX-890 is more comprehensive and thus more complex compared to AX-870 and of its five PCBs only tone corrections PCB and Tone Direct switch PCB is exchangeable. The rest is different, although the phono pre-amp with the control chip of the amp on the same PCB is almost the same, it is not exchangeable, as there are two different connectors to align with the different volume PCB and the CD input PCB of AX-890. Also the motorized volume pot and the motorized input switch known to be the most frequent pain point of many Yamaha AX family amplifiers, both from ALPS, are the same, so they can be cannibalized from their PCbs and used in the other AX amps as well.

This website is not affiliated with or sponsored by Yamaha. To purchase AX-870 spares or accessories, please contact the company via their website or visit an authorised retailer.