Sony TC-K88 (1979–1984?)
A high-end stereo cassette deck from Sony’s 88 series, featuring a motorized linear transport and metal tape compatibility.
Overview
The Sony TC-K88 is a stereo cassette deck released in May 1979 as part of Sony's premium "88 series" lineup. It features a motorized, linear skating (slide-out) cassette transport system, known as the Power Loading Cassette Module, which uses a dedicated coreless motor to extend and retract the mechanism. Designed for high-fidelity recording and playback, it supports metal tape and includes Sony's Automatic Music Sensor (AMS) for blank-skip and song search functions. The deck includes a 33-segment LCD peak program meter with tape remaining indication and was sold with the optional RM-50 wired remote controller.
Specifications
| Heads | Erase: 1, Recording/Playback: 1 (S&F head) |
| Motor | 3 BSL (Brushless & Slotless) Green Motors, plus one dedicated coreless motor for cassette compartment mechanism |
| Signal-to-noise ratio | 60 dB (Dolby off, peak level, metal tape) |
| Frequency response | 20 Hz ~ 20 kHz (Metal Tape) |
| Wow and flutter | 0.03% WRMS |
| Total harmonic distortion | 0.9% (Metal Tape) |
| Power consumption | 30W |
| External dimensions | 480 mm (W) x 80 mm (H) x 385 mm (D) |
| Weight | 10 kg |
| Tape speed | 4.75 cm/s |
| Speed accuracy | ±0.2% |
| Crosstalk (tracks) | 60 dB (1 kHz) |
| Separation (channels) | 35 dB (1 kHz) |
| Erasure | 65 dB (400 Hz, Metal) |
| Bias | 105 kHz |
| Inputs | 77.5 mV / 50 kOhm (line), 0.25 mV / low (MIC) |
| Outputs | 0.435 V (fixed), 50 kOhm ... 10 kOhm (nominal...minimum), 38.8 mV / 8 Ohm (headphones) |
| METERS | 33-segment LCD PEAK |
| METERS Frequency response | 20 Hz ... 20 kHz (±0.5 dB) |
| METERS Response time | 1 millisecond |
| METERS Decay time | 750 millisecond (from 0 dB to -20 dB) |
| METERS Response range | -40 dB ... +8 dB |
| Versions | Type 1 (220 V), Type 2 (240 V), Type 3 (110/120/220/240 V) |
Design
The TC-K88 uses a linear three-motor BSL direct-drive system with crystal-locked magnedisk servo control for precise tape speed regulation. The S&F (Sendust & Ferrite) recording/playback head is optimized for metal tape, and a four-gap erase head ensures clean signal removal. The Power Loading Cassette Module slides out horizontally via a coreless motor driving a large endless screw along extruded aluminum rails. The deck features DC record/playback amplifiers, quartz-locked speed control, and a dual-transformer power supply—one for regulated circuitry and one dedicated to the LCD meter. It lacks tape/source monitoring due to its two-head configuration.
Context
The TC-K88 was the last high-end Sony cassette deck released before the Esprit series, bridging the transition between the older ESPRIT branding and the newer "ES!" lineup. It shared design elements and parts with other high-end Sony models like the TC-K80, TC-K96R, and later TC-FX1010, but stood as the top-tier model in Sony’s 1978–1980 cassette recorder range.
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