TECHNICS RS 690U 9900U Stereo Cassette Deck 3 Motors Vintage 1977 WORK Good Look
TECHNICS RS 690U 9900U Stereo Cassette Deck 3 Motors Vintage 1977 WORK Good Look
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Technics RS-690U / RS-9900U Reference Cassette Deck – Fully Restored Worldwide Edition
The legendary Technics RS-690U and RS-9900U cassette deck system represents one of the most ambitious and overbuilt analog tape machines ever produced during the golden age of high-fidelity audio engineering.
Designed as a dual-chassis configuration with a dedicated transport unit and a separate control/amplifier module, this reference system minimizes vibration, improves signal isolation, and enhances long-term mechanical stability.
Its precision three-motor transport system, including a direct-drive capstan, delivers exceptional tape handling accuracy with wow and flutter rated at approximately 0.04% WRMS.
The true three-head configuration (erase, record, playback) allows off-tape monitoring during recording, ensuring optimal bias calibration and superior recording precision.
Frequency response extends from approximately 20 Hz to 18 kHz with normal tape and up to 20 kHz with CrO₂ tape, offering extended high-frequency detail and impressive dynamic balance.
Signal-to-noise ratio reaches approximately 57 dB (without Dolby) and up to 67 dB with Dolby B noise reduction engaged, delivering quiet backgrounds and refined analog transparency.
Built with a heavy-duty metal chassis, oversized precision flywheel, and discrete component circuitry, the system reflects the uncompromising engineering philosophy that defined Technics’ late-1970s flagship designs.
Originally released as the RS-690U for the Japanese domestic market and as the RS-9900U/RS-9900US for export markets, both versions share identical internal construction and performance architecture.
At TechnoGold Audio Vintage, we proudly offer the Japanese RS-690U version professionally modified to operate at both 115V and 230V, ensuring seamless worldwide compatibility.
Each unit has been completely restored by our specialized technical service department, including full mechanical servicing, motor calibration, electronic refurbishment, capacitor inspection, transport alignment, and comprehensive audio performance testing.
With more than 40 years of experience in the international high-end audio market, TechnoGold Audio Vintage guarantees authenticity, expert restoration standards, secure global shipping, and long-term technical reliability for discerning collectors and audiophiles.
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Full Technical Specifications
Type: Stereo cassette deck, dual chassis (separate transport and control/amplifier unit)
Tape format: Compact cassette, 4-track, 2-channel stereo
Tape speed: 4.8 cm/s (1⅞ ips)
Heads: 3-head system (1 erase, 1 record, 1 playback)
Motors: 3 motors (direct-drive capstan motor + 2 reel motors)
Frequency response:
20 Hz – 18 kHz (Normal tape)
20 Hz – 20 kHz (CrO₂ tape)
Signal-to-noise ratio:
Approx. 57 dB (without Dolby)
Up to 67 dB (with Dolby B)
Wow and flutter: Approx. 0.04% WRMS
Total harmonic distortion: Approx. 1.4%
Inputs: Line input, Microphone input
Outputs: Line output, Headphone output
Power consumption: Approx. 48 W
Power supply (our modified unit): 115V / 230V selectable, 50/60 Hz
Dimensions:
Transport unit: approx. 483 × 193 × 375 mm
Amplifier/control unit: approx. 483 × 173 × 375 mm
Weight:
Transport unit: approx. 15 kg
Amplifier/control unit: approx. 9 kg
Total system weight: approx. 24 kg
Year of manufacture: Circa 1977–1979
Country of origin: Japan
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Spain
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- Cost: FREE shipping on all orders
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- Cost: Calculated at checkout (varies by country/weight)
- Import Fees: No customs duties or additional charges apply
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