TEAC A-4070

The TEAC A-4070 is a semi-professional 4-track, 2-channel stereo reel-to-reel tape deck produced from 1972 to 1975. It features auto-reverse functionality, solid-state electronics, and is designed for high-fidelity audio recording and playback.

Track and Head System

• 4-track, 2-channel stereo/monaural system .

• Four heads: two playback heads, and two combined record/erase heads.

• Auto-reverse capability for continuous, bi-directional playback and recording.

Tape Transport and Motors

• Three motors: one hysteresis-synchronous capstan motor and two six-pole winding motors.

• Tape speeds: 3¾ ips (9.5 cm/s) and 7½ ips (19 cm/s) with ±0.5% accuracy.

• Maximum reel size: 7 inches .

• Wow and flutter: 0.06% at 7½ ips.

• Rewind speed: 90 seconds for 370m tape.

Performance Specifications

• Frequency response:
  7½ ips: 25 Hz to 24 kHz (30 Hz to 20 kHz ± 3 dB).
  3¾ ips: 25 Hz to 16 kHz (30 Hz to 13 kHz ± 3 dB).

• Signal-to-noise ratio: > 58 dB.

• Total harmonic distortion: 1% at normal level.

• Crosstalk attenuation: 50 dB at 1 kHz.

• Erasing attenuation: 60 dB at 1 kHz.

Inputs and Outputs

• Microphone input: 0.25 mV / -72dB / 600 Ohm - 10 kOhm (6.35 mm jack).

• Line input: 100 mV / 50 kOhm (RCA).

• Line input DIN: 30 mV / 10 kOhm.

• Line output (adjustable): 300 mV / 10 kOhm (RCA).

• Headphone output: 8 Ohm (6.35 mm jack) .

Additional Features

• NAB equalization.

• Multiplay and echo functions.

• Vertical and horizontal operation possible.

• Bias current selection switch for low-noise tape.

• Reel clamp mechanism and reel table height adjustment.

• Full-scale VU meters.

• Timer recording/playback is possible with a separate timer control adapter.

Physical Specifications

• Dimensions: 454 x 456 x 236 mm (WxHxD).

• Weight: 23 kg.

• Power consumption: 140 W