Imagine hearing your favorite cassette tapes come alive again — warm highs, deep lows, and every nuance preserved without harshness. The Sansui D-770R is more than just nostalgia; it’s a statement of analog excellence. Its auto-reverse mechanism means you can listen both sides without flipping the tape, and the dual memory/repeat lets you relive particular sections endlessly. Dolby C (as well as B) dramatically cuts hiss, making quiet passages sound clean and detailed. For vintage lovers, this deck is a gem — mechanically robust, gorgeous in its design, and a symbol of Japanese engineering at a time when audio equipment was made to last. Whether you want it for listening or display, the D-770R earns pride of place in any collection.
Technical Description
| Specification | Detail |
| Model / Type | Sansui D-770R – Auto-Reverse Stereo Cassette Deck |
| Manufacture Period | Approximately 1982-1984Â |
| Dimensions / Weight | Width: 430 mm • Height: 111 mm • Depth: 324 mm • Weight: ~6.6 kg |
| Power Consumption | ~32 WÂ |
| Tape Types Supported | Normal (Type I), Chrome (Type II), Metal (Type IV)Â |
| Track / Head System | 4-track, 2-channel stereo; hard permalloy head for recording/playback; ferrite erase heads |
| Motors / Drive | Three motors: one for capstan, one for reel, plus a cam motor for the pinch roller and head base shifting. Full logic control. |
| Auto-Reverse / Reverse Mechanism | Computer reverse with infrared photocoupler sensor; fixed head that doesn’t mechanically move up/down or rotate; very fast switching (around 0.6 seconds) |
| Noise Reduction | Dolby B & Dolby C systems; C offers up to ~20 dB noise reduction in relevant frequency ranges. |
| Signal-to-Noise Ratio (S/N) | > 60 dB (Dolby off), improved to ~70 dB with Dolby B, and ~80-81 dB with Dolby C in many tests. |
| Frequency Response | Normal: ~20 Hz up to ~17-19 kHz; Chrome: up to ~20 kHz; Metal: extends higher (around 20-23 kHz depending on conditions). |
| Wow & Flutter | Less than ~0.045 % WRMS (weighted root mean square)Â |
| Input Sensitivity / Impedance | Mic input: ~0.4 mV, 200 Ω to ~5 kΩ; Line input: ~70 mV / 47 kΩ |
| Output Levels | Line out (playback): ~350 mV / 47 kΩ; Headphones: ~100 mV / 8 Ω |
| Special Features | • Dual memory repeat (between two user-defined points) • AMPS (Automatic Music Program Search) – allows jumping ahead/back up to ~15 tracks if there are ~4 seconds of silence between songs. • Real-time / dual-mode electronic counter (minutes/seconds or tape counter) • Timer function for REC / PLAY |
| Voltage / Regions | Many units have automatic voltage switch or dual voltage; designed for international usage in some cases. Â |
