YAMAHA AX-900

Commentary

Pre-main amplifier with LiD power supply and ALA circuit technology.

A powerful LiD (Low-impedance Drivability) power supply provides a stable power supply.
It is equipped with a GT transformer (7.5 kg, 350 VA) of anti-vibration design in which many EI type cores are magnetic shield covers and the inside is filled with silica sand and polybutadiene resin.
In addition, a 22000 μ Fx2 high-speed, low-impedance design Digital Ready Chemicon and an extra-thick OFC power supply cable have been adopted to improve the margin.

It is equipped with an ALA (Absolute Linear Amplification) circuit that enables linear amplification according to the input signal level, eliminating even slight distortion that causes sound dullness, such as crossover distortion and switching distortion generated in the power stage.

An independent power supply circuit is mounted for each of the pre-section and power section.
The signal board is completely separated from the phono equalizer, pre-circuit and power circuit, and the signal paths are arranged so that they do not overlap each other. This improves S/N and ensures a low distortion factor.
In addition, a connecting rod remote type speaker switch is used to avoid wiring of the high output speaker signal.

In order to transmit the high sound quality of CD directly, it is equipped with a CD direct switch in which the CD source can be enjoyed with the highest priority over other inputs.
A CD Direct Preamp is separately supplied for high-purity amplification, audio muting, volume, and a CD Direct Preamp are used for simple and straight preamp configuration. The CD Direct Preamp is the shortest path.

It is equipped with a double REC OUT selector that can record different sources simultaneously and independently.
This allows you to use multiple decks at the same time, such as air check with Tape1 and CD recording with Tape2.

Equipped with continuous (continuously variable) loudness that balances the sense of hearing by narrowing down the middle range without increasing the low and high range.
While the normal volume position remains unchanged, the more the continuous loudness is reduced, the more the mid-range volume is reduced. The optimum volume is set for the low-range and high-range according to the amount of change in the reduced mid-range. This allows you to eliminate the lack of volume in the low-range and high-range at low volume with your preferred tone.

Equipped with 3 band tone control of Bass, Mid, and Treble.
It also has a tone bypass switch to defeat the tone circuit.

Equipped with a real-time phono equalizer amplifier that employs a low-noise transistor.

Equipped with MM/MC cartridge selector.

Equipped with a subsonic filter switch, high filter switch, stereo / mono mode selector switch, balance control, A/B2-channel speaker selector switch, overload protection circuit and headphone jacks.

Equipped with pre-out and main-in terminals that can be used independently for pre-amplifier and power amplifier sections.

Equipped with an AC outlet with polarity display for 2 power supply connections and 1 non-connection connection connection, and a power cord with polarity display.

Model Rating

Type	Pre-main amplifier
Rated Output (20 Hz ~ 20 kHz)	150W + 150W (6 Ω, 0.005% strain) 130W + 130W (8 Ω, 0.003% strain)
Power bandwidth	10 Hz ~ 50000 Hz (65W, 8 Ω, 0.03% strain)
Damping factor	150 or More (1 kHz, 8 Ω)
Input Sensitivity / Impedance	MC : 160 μ V/220 Ω MM : 2.5mV/47k Ω AUX and others : 150mV/47k Ω Main In : 1V/47k Ω
RIAA deviation	20 Hz to 20000 Hz, ± 0.3 dB (MC)
Total harmonic distortion factor (20 Hz to 20 kHz)	MC:0.005% MM:0.003%
S/N ratio (IHF-A)	MC:70dB MM:86dB
Tone control (Maximum Variable Width)	Treble : ± 10 dB (20 kHz) Mid : ± 10 dB (1 kHz) Bass : ± 10 dB (20 Hz)
Loudness	Continuus
Pwer	100 VAC, 50Hz/60Hz
Power consumption	260W
External dimensions	Width 435x Height 165x Depth 416 mm
Weight	17.5kg