Yamaha a-720 Natural Sound Integrated Amplifier, 1985-1986, made in Japan

Country:  Japan
Manufacturer / Brand:  Yamaha Co.; Hamamatsu
alternative name Nippon Gakki
Year: 1985/1986 Category: Audio Amplifier or -mixer
Semiconductors (the count is only for transistors) Semiconductors present.
Reception principle Audio-Amplification
Wave bands - without
Power type and voltage Alternating Current supply (AC) / 220 Volt
Loudspeaker - This model requires external speaker(s).
Power out 300 W (unknown quality)
Model: A-720 - Yamaha Co.; Hamamatsu
Material Metal case
Shape Book-shelf unit.
Dimensions (WHD) 435 x 147 x 399 mm / 17.1 x 5.8 x 15.7 inch


  • HiFi Amplifier
  • 2x105 watts into 8 ohms
  • 2 x 150 W into 4 ohms DIN
  • fractionated pre-amplifier
  • Phono switch MM / MC
Power output: 105 watts per channel into 8Ω (stereo)
Frequency response: 20Hz to 20kHz
Total harmonic distortion: 0.005%
Damping factor: 45
Input sensitivity: 0.16mV (MC), 2.5mV (MM), 150mV (line)
Signal to noise ratio: 76dB (MC), 92dB (MM), 106dB (line)
Channel separation: 70dB (MM), 65dB (line)
Output: 150mV (line)

Net weight (2.2 lb = 1 kg) 10.2 kg / 22 lb 7.5 oz (22.467 lb)
Price in first year of sale 1,030.00 DM
Source of data -- Original prospect or advert

service manual