Kenwood KA-5700 Integrated Amplifier


Generally hifi-wiki.de
  • Manufacturer: Kenwood
  • Model: KA-5700
  • Year of construction: 1978
  • Manufactured in: Japan
  • Color: silver
  • Type: Analog
  • Remote Control: No
  • Power consumption: 280 watts
  • Dimensions: 380 x 140 x 297 mm (W x H x D)
  • Weight: 7,5 kg
  • Original price ca .: 680, - DM








Connections
  • Number of inputs:
    • Tuner, Phono, Aux, Tape
  • Number of Outputs:
    • Tape Rec Out, Headphone output (6.3 mm jack)

Specifications
  • Continuous power (at THD)
    • 8 Ohm: 2x 40W (20-20,000 Hz)
    • 4 ohms: 2x 55 W (1 kHz)
  • Dynamic performance
    • 8 Ohm:
    • 4 ohms: 170 W
  • THD: 0.04% (8 ohms), 0.02% (4 ohm) at rated power
  • Damping factor: 30 (8 Ohm)
  • Power Bandwidth: 10-40000 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: + 7 dB at 100 Hz (at a level of -30 dB)
  • High filter: no
  • Low filter (Subsonic): yes (18Hz, 6dB / oct.)
Special Features
  • VU meters

Comments

Original Kenwood Description
  • The powerful output stage has a huge dynamic range 
and guarantees distortion-free spectrum resources to the modulation limit.
  • Due to the unusual noise ratio of 76 dB are also at full
without any input signal noise such as hum or noise of the amplifier perceptible.
  • Built-in, calibrated in Watt power meter enable ongoing monitoring
the actual output power and thus the exact symmetry setting of the two stereo channels.
  • The protective circuit for short circuits and overloads to immediately
and preserves the valuable amplifiers transistors as well as the connected speakers from damage.
Key features (from the orig. Instructions)
  • Power amplifier stage with minimal THD
The power amplifier is kept in direct coupling and consists of a fitted with current mirror circuit differential amplifier, a Darlington circuit operational class A and a pure complementary circuit. The current mirror circuit not only leads to a high gain, but also guarantees excellent stability in the differential amplifier. The amplifier design of the class A operation in the second stage is provided with a equipped with PNP-transistors Darlington circuit, which in turn contributes to high stability of the current mirror circuit used in the first stage. This sophisticated circuitry responsible for the 40 watts per channel into 8 ohms, with a THD of only 0.04% over the entire audible frequency range of 20 to 20000Hz very high Sinusdauertonleistung.