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Yamaha AX-890

Stereo Integrated Amplifier (1995-96)

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Yamaha AX-890

Specifications

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: 50dB (line)

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

Dimensions: 435 x 171 x 448mm

Weight: 14.2kg

Accessories: remote control transmitter

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Reviews

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Reviewed Feb 10th, 2018 by jayan.pta

Integrated amplifier using CD direct amplifier and linear damping circuit.

The CD direct amplifier is carried and realizes CD reproduction with less deterioration.
In this method, by installing a low-noise amplifier immediately after the input terminal, the S / N ratio with the volume actually used is improved by 10 dB. In addition, the impedance also decreases, so it is less affected by external noise.
The AX - 890 adopts a 2 - parallel push - pull circuit in which two elements are connected in parallel to this amplifier, enabling a drive with a large space even in the case of a large signal.

Yamaha adopt its own linear damping circuit.
In this method,they have acquired a stable damping factor by thorough internal impedance reduction measures such as adopting a very thick wire material, so that it does not depend on the form and characteristics of the speaker, allowing enough drive under any circumstances

The pure direct switch is carried, and it is possible to bypass the circuit such as tone control and directly connect the input to the power amplifier.

The symmetrical design from the input of the power amplifier to the output terminal is designed so as to reduce the turbidity and distortion of the sound by reducing interference.

Many of the internal contacts such as the CD input terminal, input selector, and relay are plated with gold.

The continuous loudness circuit is carried.

Equipped with a pre-main coupler, the preamplifier part and the power amplifier part can be used independently.

Yamaha's component remote control is also included that can also operate components

 

Comments

re: AX-890

Excellent quality precision stereo amplifier. Yamaha quality amps starts from the 7xx series.This one is the 8xx series ,heavily built @around 15 kgs. Truly hi fi stereo with very less THD of 0.008 and very high Damping Factor of 320 which gives quality base for almost all branded bookshelf or tower speakers.

AX-890 vs AX-870 main circuitry

These two amps appear to be almost the same on paper and from outside, but inside the story is a bit different.
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 in both of them, 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 the tone corrections PCB and Tone Direct switch PCB are 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-890 spares or accessories, please contact the company via their website or visit an authorised retailer.