Висок клас ретро интегриран стерео усилвател на Yamaha, произвеждан в периода 1986–1990 г.
Отличен технически и визуално - има леко одраскване горе вдясно на лицевия панел, което се вижда на снимката (вижда се само отблизо).

General

Manufacturer:
Yamaha

Model: AX-900
Type: Integrated amplifier
Years of manufacture: 1986 - 1988
Made in: Japan
Colors: Silver, Black
Remote control: No
Power Consumption: 600W

Dimensions: 435 x 165 x 416 mm (WxHxD)

Weight: 17 kg
Original price approx.: 1'350 DM

Number of inputs:

Phono MM/MC, tuner, 2 x tape, DAT, aux, CD, preamplifier.

Number of outputs:

2 x speakers, 3 x rec-out, headphones, power amp

Technical Data

Continuous power (at distortion factor)
8 Ohm: 2 x 130 Watt at 0,005 %
6 Ohm: 2 x 150 Watt at 0,008 % (DIN)
4 Ohm: 2 x 217 Watt at 1,000 % (according to DIN)

IEC power

4 Ohm, 1 kHz: 140 Watt (1 % distortion)
Dynamic power
8 Ohm: 2 x 180 Watt
4 Ohm: 2 x 320 Watt
2 Ohm: 2 x 440 Watt
1 Ohm: 2 x 520 Watt
Buffering : 2 x 22.000 µF
Total harmonic distortion: 0,005 %
Intermodulation distortion
CD, Video-AUX, Tuner, Tape (up to Speaker Out 130 Watt / 8 Ohm): 0.002 %

1 Watt / 8 Ohm: 0.003 % * Power bandwidth

Power bandwidth
8 Ohm, 65 Watt, distortion factor 0.03 %: 10-50,000 Hz
Attenuation factor: 150 (8 Ohm, 1 kHz)
Input (Sensitivity / Impedance)
Phono MM: 2.5 mV / 47 kOhm
Phono MC: 160 µV / 220 Ohm
Tuner, CD, Aux, DAT, Tape: 150 mV / 47 kOhm
Output (level / impedance)

Rec-Out 150 mV / 470 Ohm

Headphones 0.93 V / 8 Ohm (distortion factor 0.005 %)
Frequency response CD, Video-AUX, Tuner,
Tape, Main-In: 20-20,000 Hz (+0db, -0.5 dB)
Tone control:
Bass: ±10 dB at 20 Hz, crossover frequency 350 Hz.
Mids: ±10 dB at 1,000 Hz
Treble: ±10 dB at 20,000 Hz, crossover frequency 3,500 Hz.
Loudness:
Level-related attenuation control
Attenuation -40 dB (1 kHz)
Subsonic: 15 Hz / 12 dB/octave, switchable
Mute: yes (-20 dB)
Direct/Line-Straight: CD-Direct, tone control switchable
Ripple spacing (short-circuited): 106 dB
Stereo channel separation: 70 dB (volume -30 Db)
Signal-to-noise ratio
Phono MC: 74.5 dB; IHF value 72 dB

Phono MM: 78 dB; IHF value 92 dB
CD, Video-AUX, Tuner, Tape: 85 dB; IHF value: 100 dB

Intermodulation distortion
CD, Video-AUX, Tuner, Tape (nominal output/8 Ohm): 0.002 %
1 Watt / 8 Ohm: 0.003 %
Gain tracking error
0 dB to -60 dB: 2 dB

Special Features

2 x record selector
Accessory connectors
Mono/stereo switch
High filter switchable (10 kHz / 12 dB/octave)
Pre- and power amplifier can be separated, jumper plug enclosed