Name: Teac A-6700DX
Brand: Teac

A Japanese-market, dual-section reel-to-reel tape recorder with 4-head configuration and Simul-Sync capability

Overview

The Teac A-6700DX is a high-end reel-to-reel tape recorder designed for professional and semi-professional use, released as a Japanese-market model. It consists of separate transport and amplifier units, supporting a two-track, two-channel stereo system with additional 4-track playback. The deck features Simul-Sync—a technology pioneered by TEAC on the A-3340—which enables independent recording on all four tracks, allowing multitrack recording in a home or project studio environment.

Specifications

Model	Teac A-6700DX
Manufacturer	Teac
Product type	Reel to Reel Tape Recorder; Separately transport and amplifier unit
System	Two-track, two-channel stereo system. Erase (full track), Record, Play, and 4-track play
Head configuration	Four-head configuration (Erase, 2-Track Rec, 2-Track PB, 4-Track PB)
Tape speeds	15 ips (38 cm/s) and 7.5 ips (19 cm/s)
Transport	Three-motor transport (FG-servo DC capstan + two reel motors)
Motor	Brushless DC Servo motor
Wow & Flutter	0.018% (WRMS)
Frequency response	20Hz - 22kHz (Metal tape)
Signal-to-noise ratio	70dB (Dolby C)
Total harmonic distortion (THD)	0.8%
Channel separation	about 50 dB at 1 kHz
Equalization standards	NAB / IEC (BTS)
Bias adjustment	6-step selectable bias
Inputs	2 x mic, 2 x line
Outputs	2 x line, 1 x headphone
Tracks	4-track
Key Features	Simul-Sync
Dimensions	Transport section: 478 × 419 × 268 mm; Amplifier section: 478 × 177 × 237 mm
Weight	18.5kg
Power input	110V

Design

The A-6700DX is a 10.5-inch reel, 1/4-track stereo recorder with a 3-motor transport system and four-head configuration. It uses a brushless DC servo motor for the capstan and DC servo motors for the reel drives, ensuring precise tape control. The transport is microprocessor-controlled and includes an auto-reverse function for continuous playback. The unit includes built-in Dolby B noise reduction and supports both NAB and IEC equalization standards with 6-step bias adjustment for optimal tape calibration.

Context

The Simul-Sync feature originated with the Teac A-3340 in 1972, enabling true multitrack recording by allowing independent recording on all four tracks. The A-6700DX continues this lineage, offering advanced functionality for its time in a modular, dual-unit design.

Market

Current market prices for the Teac A-6700DX include listings at £2,500 and $1,800 for tested, fully working units in used condition with minor cosmetic wear. Common issues include aged capacitors requiring replacement, particularly in the power supply and audio circuits, as well as hardened belts, idler tires, and glazed pinch rollers that may need servicing due to age.