Marantz - SD4020 Cassette recorder-player

Specifications
Type: compact 3-head recorder
Tape transport system: 4-track, 2-channel stereo
Tape speed: 4.75, 9.52 cm/s
Heads: 1 x recording, 1 x playback, 1 x erase
Motor: 1 x DC servo motor
Tape type: Type I, FeCr, CrO2, Metal
Noise reduction: Dolby B
Frequency response: 30 Hz to 19 kHz (metal tape)
Signal-to-noise ratio: 67 dB (Dolby B)
Wow and Flutter: 0.06%
Input: 70 mV (line), 0.25 mV (microphone)
Output: 0.65 V (line)
Semiconductors: 59 transistors, 6 integrated circuits, 34 diodes, 6 LEDs
Dimensions: 416 x 146 x 243 mm
Weight: 7 kg
Year: 1980