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Specifications
Power output: 22 watts per channel into 8Ω (stereo)
35 watts per channel into 4 ohms (stereo)

Frequency response: 20Hz to 45kHz

Total harmonic distortion: 0.8%

Damping factor: 30

Input sensitivity: 3mV (mic), 3.5mV (MM), 220mV (line)

Speaker load impedance: 4Ω (minimum)

Semiconductors: 4 x IC, 6 x transistors, 17 x diodes

Dimensions: 430 x 97 x 236mm

Weight: 4.7kg

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Manufacturer: Nikko
Model: NA-690
Type: Integrated amplifier
Years of manufacture: 1979 - 1981
Made in: Japan
Colors: Silver, Black
Remote control: no
Power consumption:
Dimensions: 420 x 138 x 335 mm (WxHxD).
Weight: 11 kg
Original price approx.: 250 US-$, 800 DM

Connections

Number of inputs:
Phono MM: 2.3 mV / 47 kOhm, 140 mV max.
Tuner: 150 mV / 39 kOhm
Aux: 150 mV / 39 kOhm

Tape Play: 150 mV / 39 kOhm
Number of outputs:
Tape Rec: 150 mV / 39 kOhm
Headphones: 6,3 mm jack, front
2 pairs of speakers

Technical Data

Continuous power
8 Ohm: 2x 45 W (RMS, 20 - 20'000 Hz, 0,04 %)
4 Ohm: 2x 70 W
dynamic power
8 Ohm:
4 Ohm:
Total harmonic distortion: 0.03 %
Attenuation factor: 50 at 8 Ohm
Frequency response:
Phono: 20 - 20'000 Hz
High level: 5 - 40'000 Hz
Signal to noise ratio:
Phono MM: 80 dB
High level: 90 dB
Tone control:
Bass at 70 Hz: ± 10 dB
Treble at 10 kHz: ± 10 dB
Loudness: yes, + 10 dB at 70 Hz, + 6 dB at 10 kHz
Low Filter: yes, - 6 dB / octave at 20 Hz
High Filter: yes, - 6 dB / octave at 7 kHz