Kenwood KA-5700

Data

General

• Manufacturer: Kenwood
• Model: KA-5700
• Type: Integrated amplifier
• Years of manufacture: 1977 - 1979
• Made in: Japan
• Color: Silver
• Remote control: No
• Power consumption: 280 W max.
• Dimensions: 380 x 140 x 297 mm (WxHxD)
• Weight: 7.5 kg
• Original price approx.: 598 DM

Connections

• Number of inputs:
  • Tuner,Phono,Aux,Tape
• Number of outputs:
  • Tape Rec Out, Headphone Output (6.3mm jack).

Specifications

• Continuous power (at distortion)
  • 8 Ohm: 2x 40 W (20-20,000 Hz)
  • 4 Ohm: 2x 55 W (1 kHz)
• Dynamic power
  • 8 Ohm:
  • 4 Ohm: 170 W
• Total harmonic distortion: 0.04% (8 Ohm), 0.02% (4 Ohm) at rated power
• Attenuation factor: 30 (8 Ohm)
• Power bandwidth: 10 - 40,000 Hz
• Signal-to-noise ratio:
  • Source: 100 dB

phono: 76 dB

• Stereo channel separation:
• Tone control:
  • Bass: ±7.5 dB
  • Treble: ±7.5 dB
• Loudness: +7dB at 100Hz (at a level of -30dB)
• High Filter: no
• Low Filter (Subsonic): yes (18Hz, 6dB/oct.)

Special Features

• VU Meter

Remarks

• Other models in the same series:
• Kenwood KA-3700
• Kenwood KA-5700
• Kenwood KA-6100
• Kenwood KA-6150
• Kenwood KA-7100
• Kenwood KA-7150
• Kenwood KA-8100
• Kenwood KA-8150
• Kenwood KA-9100
• Kenwood KA-9150
• Kenwood Model 500
• Kenwood Model 600
• Kenwood Model 650

Pictures

• Picture: Kenwood KA-5700

Reports

Original Kenwood Description

• The powerful power amplifier has a tremendous dynamic range and guarantees distortion-free reproduction of the usable frequency spectrum up to the level limit.
• Due to the unusual noise voltage ratio of 76 dB, no noise such as hum or inherent noise of the amplifier is perceptible even at full scale without input signal.
• Built-in watt-calibrated power meters allow continuous monitoring of the actual output power and thus also the exact symmetry adjustment of the two stereo channels.
• Protection circuitry responds immediately to short circuits and overloads, protecting the valuable power amp transistors as well as the connected speakers from damage.

Special Features (from the orig. manual)

• Power amplifier stage with lowest distortion
• The power amplifier is direct-coupled and consists of a differential amplifier equipped with a current mirror circuit, a Darlington circuit of operating class A and a purely complementary circuit. The current mirror circuit not only results in high gain, but also ensures excellent stability in the differential amplifier. The class A amplifier design incorporates a Darlington circuit with PNP transistors in the second stage, which in turn contributes to high stability of the current mirror circuit used in the first stage. This sophisticated circuitry is responsible for the very high continuous sinusoidal sound power of 40 watts per channel at 8 ohms, with a distortion of only 0.04% over the entire audible frequency spectrum from 20 to 20000Hz.