Kenwood KA-907

Data

General

• Manufacturer: Kenwood
• Model: KA-907
• Type: Stereo integrated amplifier
• Years of manufacture: 1979 - 1981
• Made in: Japan
• Colour: Silver, variants Kenwood KA-9077 in grey metallic, Trio KA-9900 Japan execution
• Power consumption: 1000 W at full power
• Dimensions (WxHxD): 460 x 161 x 463 mm
• Weight: 25,8 kg
• Original price approx.: 2'798 DM
• New price D-90 handles: 200 DM

Connections

• Number of inputs:
  • Input sensitivity:
  • Phono 1 MM: 2.5mV, 33 kOhm, 47 kOhm, 100 kOhm, max 230mV RMS (1Khz, 0.01% THD).
  • Phono 1 MC: 0.1mV, 100 Ohm, max. 9mV RMS (1Khz, 0.01% THD)
  • Phono 2 MM: 2.5mV, 47 kOhm, 47 kOhm, 100 kOhm, max. 230mV RMS (1Khz, 0.01% THD)
  • Tuner: 150mV, 50 kOhm
  • AUX 1,2: 150mV, 50 kOhm
  • Tape Play A, B: 150mV, 50 kOhm
  • Main In: 1V / 50kOhm
• Number of Outputs:
  • Outputs:
  • Tape Rec: 150mV, 180 Ohm

DIN: 30mV / 80 Ohm

• • Pre Out: 9V max. / 750 Ohm
  • Headphones
  • 2 pairs of speakers

Technical Data

• Continuous power (at THD)
  • 8 Ohm: 2x 150W (RMS, 20 Hz - 20 kHz, 0.01% THD), 2x 150W (1Khz)
  • 4 Ohm: 2x 180W (1Khz)
• Dynamic power
  • 8 Ohm:
  • 4 Ohm:
• Total harmonic distortion:
  • Phono: 0.01% (rated power, volume at -20dB).
  • Phono IMD: 0.0045% (nominal power, 8 Ohm)

High Level: 0.01% (nominal power, 20Hz - 20kHz, 8 Ohm)

• • High Level: 0.006% (1/2 nominal power, 20Hz - 20Khz, 8 Ohm)
• Attenuation Factor: 100 (DC - 20Khz, 8 Ohm)
• Frequency Response:
  • DC - 400 kHz (+0 / -3dB, DC ON).
  • 1Hz - 400kHz (+0 / -3dB, DC OFF)
  • 20Hz - 20kHz (RIAA, ±0.2dB)
• Power bandwidth: 5Hz - 100Khz (0.03% THD), -70dB (DIN 45500)
• Signal-to-noise ratio:
  • Phono 1, 2 MM: 90dB at 2.5mV
  • Phono 1, 2 MM: 96dB at 5,0mV
  • Phono 1, 2 MM: 102dB at 10mV
  • Phono 2 MC: 70dB at 0,1mV
  • Phono 2 MC: 76dB at 0.2mV
  • Phono 2 MC: 105dB at 150mV
  • Tuner, AUX, Tape, A, B: 105dB for 150mV input
• Rise Time: 0.5 to 0.8 µS
• Slew Rate: ± 230V/µS
• Tone Control
  • Bass:
    • 150Hz : ± 7.5dB at 75Hz, ±10dB at 25Hz.
    • 400Hz : ± 7.5dB at 155Hz, ±10dB at 50Hz.

Treble:

• • • 3Khz : ± 7.5dB at 10kHz, ±10dB at 20kHz
    • 6Khz : ± 7.5dB at 20kHz, ±10dB at 40kHz

Loudness : +3 / +6 / +9dB at 30Hz or 100Hz

• High Filter : 12dB / octave above 8Khz
• Subsonic Filter : 6dB / octave below 18Hz

Special Features

• Pre- / power stage separable

Remarks

• Other models in the same series:
  • Kenwood KA-305
  • Kenwood KA-501
  • Kenwood KA-601
  • Kenwood KA-701
  • Kenwood KA-801
  • Kenwood KA-907

• Corresponding Tuner
  • Kenwood KT-917

Pictures

• Extract from brochure: Kenwood KA-907

Reviews

• Audio Test attested real 202+202 watts at 8ohms and 308+308 watts at 4 ohms.

• Review by "Hifi Studio": [1]

• Report from "Mackers": [2]

• Report from "Good Old Hifi": [3]

• Fascination Kenwood KA-907!
• An amp. with unadulterated sound, absolute noise-free, stereo channel separation, the minimum distortion up to the highest volumes, no matter what speakers. The 907 shows how good speakers are. If the sound is bad, it is because of the speakers! An amp should reproduce signals without distortion, preferably with a lot of power, and the 907 does that brilliantly! The quality is unique! Especially for phono lovers! Developed by Trio-Kenwood!

Links

• External link to website "Hifi Archive": [4]

• External link on website "The Vintage Knob": [5]