TEAC A-630 (c. 1976)
At 11 kg, it sits on the shelf like a serious machine. It is built for durability and precision.
Overview
The TEAC A-630 is a stereo cassette deck from around 1976. TEAC was pushing to refine high-fidelity cassette recording for the serious home user, and this deck was part of that. It cost ¥99,800 at launch, which put it in the mid-to-upper part of the lineup. It inherited core technology from the more advanced A-650 and delivered no-nonsense performance. It measures 440 mm wide, 177 mm tall and 325 mm deep. The 11 kg mass comes from the dual-motor mechanism inside. That design dropped the complex idler wheels and pulleys in favor of dedicated drive systems for capstan and reels. The 2-motor setup uses a mechanical governor type DC motor for the reel and an FG servo DC motor for the capstan. Wow and flutter is a low 0.06%, as noted in HiFI-Stereo (August 1984, p.82).
Operation is by push-button controls with a 2 mm stroke, using micro switches chosen for long-term reliability. Logic control lets you switch directly between any operating modes - no need to pass through stop or eject. That helps if you record or edit a lot. The mechanism takes C-60 and C-90 tapes in a 4-track, 2-channel stereo format. It uses an HD ferrite head with excellent wear resistance, which suits a deck expected to see regular use. An oil-damped eject system opens and closes the cassette holder smoothly. A removable cover over the mechanism makes cleaning and maintenance easier.
Frequency response is 30 Hz to 16 kHz with chrome tape and 30 Hz to 13 kHz with regular tape. Those figures fit high-grade cassette decks of the mid-1970s. Signal-to-noise ratio is rated at 57 dB (measured at 3% THD with WTD), a solid figure for the time. The Dolby noise reduction system adds 5 dB improvement at 1 kHz and 10 dB or more above 5 kHz. Input sensitivity is 60 mV into 50 kΩ for line and 0.25 mV (-72 dB) into 600 Ω or higher for microphone. Independent level controls let you mix microphone and line sources, which is handy for voice-over or field recording. Output is 0.3 V into 10 kΩ or higher on the line. The headphone output is specified at 8 Ω, so it suits the low-impedance headphones common at the time.
The A-630 has several advanced features for its class. A built-in memory counter can be preset to 000, and when rewinding it stops automatically at the 999 mark. A Rec Mute function silences the recording momentarily without stopping the tape. Timer recording works through external audio timers. Timer playback is also possible if the tape's write-protect tab is folded. A bias and equalizer independent switching mechanism, controlled by a two-stage selector, sets chrome, ferrochrome and high-bias tapes correctly. A mono/stereo switch is linked to "My Kujac" (a proprietary TEAC circuit) for monaural recording with a single microphone. Plug into the left microphone jack and the signal splits to both channels, giving a center-panned source. The peak level meter uses a double-wave rectification detection circuit, designed to respond accurately even to asymmetric musical waveforms.
Historical Context
The TEAC A-630 appeared while cassette technology was maturing fast, moving from portable convenience to a legitimate medium for high-fidelity home audio. It is a 2-motor deck that inherited functions and technology from the A-650, a more premium model, at a more accessible price. It belonged to a series that included the A-170, A-400, A-420, A-440, A-460, A-640, and A-650, a family of cassette decks that spanned performance and price tiers. The A-650 was the peak of TEAC's cassette engineering at the time. The A-630 brought logic control, dual motors and precise tape handling to a broader audience.
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