Akai GX-280D-SS (1973–1976)
A discrete 4-channel reel-to-reel tape deck with automatic reverse and GX heads, built for surround stereo recording and playback.
Overview
The Akai GX-280D-SS is a 4-channel tape deck produced from 1973 to 1976, designed for discrete quadraphonic recording and playback. It's part of Akai’s GX-series professional reel-to-reel line, featuring a 4-head configuration and 3-motor drive system. The deck supports 4-track, 4/2-channel operation on 1/4-inch tape, with compatibility for up to 7-inch reels. Marketed as a "Surround Stereo" and "professional 4-channel tape deck," it was aimed at audiophiles and engineers exploring quadraphonic sound.
Specifications
| Model Rating | 4-channel tape deck |
| Track System | 4-track, 4/2-channel stereo/monaural system |
| Heads | 4-Head, GX Head |
| Motors | 3-Motor |
| Tape speeds | 3 3/4, 7 1/2 ips (9.5 cm/s, 19 cm/s) |
| Equalization | NAB |
| Maximum reel size | up to 7 inch reel |
| Signal-to-noise ratio | 58 dB |
| Total harmonic distortion | 0.8% |
| Input sensitivity | 100mV (line), 10mV (DIN), 0.5mV (mic) |
| Output level | 1.23V (line), 0.4V (DIN) |
| External dimensions | Width 430 x Height 505 x Depth 250 mm |
| Weight | 21.5 kg (47.3 lbs) |
| Original price | ¥199,000 (around 1975), $650 (no year specified) |
Design
The GX-280D-SS uses a direct capstan drive system with servo motors and features Akai's GX head technology, claimed to have a lifespan of 150,000 hours—significantly longer than typical steel heads. It supports 4-channel continuous playback via an auto-repeat circuit and allows 2-channel Oatley Verse playback. The deck includes automatic reverse functionality and is built for 4-channel recording and reproduction using discrete 4-track tape.
Context
The GX-280D-SS belongs to a family of Akai 4-channel tape decks including the 202D-SS, 1730D-SS, 1730-SS, and GX-400D-SS. It was positioned as a professional-grade machine for surround stereo applications during the quadraphonic audio era.
Market
Average sale prices have ranged from $100 to $250, with some units listed as high as $749 in recent years. Common service needs include capacitor replacement, new belts, and oscillator relay repairs. Reel motors and restoration kits are available as spare parts. Some units have been reported with modified or missing connectors after servicing.
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