TEAC A-6700 DX

The Teac A-6700DX is a semi-professional reel-to-reel tape deck produced in Japan starting in 1978, designed primarily for studio use and high-fidelity audio applications. It features a separate transport and preamplifier unit connected by cables stored in a compartment at the back of the transport.

• Track System:
  1/2 track recording and playback plus 1/4 track playback capability.

• Tape Speeds:
  7½ inches per second (ips) (19 cm/s)
  15 ips (38 cm/s)
  Both speeds have a tolerance of ±0.5%.

• Heads:
  Four heads total:
  Erase head (full track)
  Two-track record heads made of cobalt-amorphous material
  Two-track playback heads made of Permalloy.

• Motors:
  Three motors:
  Capstan motor is an FG servo DC motor for precise speed control
  Two reel motors are eddy current types for smooth tape tension and transport.

• Frequency Response:
  25 Hz to 28 kHz at both 7½ and 15 ips, indicating very wide and flat response suitable for high-fidelity recording and playback.

• Wow and Flutter:
  0.03% at 15 ips
  0.06% at 7½ ips (weighted RMS), reflecting excellent speed stability.

• Signal-to-Noise Ratio:
  60 dB (NAB equalization).

• Distortion:
  Approximately 0.6% at reference level.

• Stereo Separation:
  50 dB at 1 kHz.

• Rewind Time:
  Approximately 160 seconds for a 550-meter tape.

• Inputs and Outputs:
  Microphone input: 0.25 mV / -72 dB / 600 Ω or higher
  Line input: 60 mV / 50 kΩ
  Line output: 0.45 V / load 10 kΩ or higher
  RCA connectors.

• Equalization:
  NAB and IEC standards supported, with bias adjustment settings from 100% to 150% and recording EQ adjustable from 1 to 10.

• Transport and Tape Handling:
  Full logic controls for function switching without engaging stop.
  Tension servo and impedance roller maintain proper tape tension and absorb uneven running due to flywheel effects.
  No auto-reverse feature.

• Physical Dimensions and Weight:
  Transport unit: 419 x 478 x 268 mm, weighing 25 kg
  Preamplifier unit: 177 x 478 x 237 mm, weighing 8 kg.

• Power:
  100 V (Japan standard).

• Additional Features:
  RCA tape head output allows connection to external tape head preamplifiers.
  Optional external DBX noise reduction unit (RX-15) can be connected.
  Peak level indicator and separate left and right recording fine input adjustments with master control.

• Market and Rarity:
  Designed exclusively for the Japanese market.
  Very rare, with few units found outside Japan.