Sony ST JX4 (1981–1982)
A digital synthesizer tuner from Sony's early 1980s lineup, delivering stereo FM/AM reception with quartz-locked precision.
Overview
The Sony ST JX4 is an AM/FM stereo tuner produced from 1981 to 1982. It features digital tuning technology with a quartz lock synthesizer system for stable frequency reception. Designed for high-fidelity audio setups, it provides stereo left/right audio outputs and operates across the standard FM (87.5–108 MHz) and AM (530–1610 kHz) bands. Units have been observed in silver finish, often accompanied by original packaging including the box, styrofoam inserts, and user manual.
Specifications
| FM tuning range | 87.5-108MHz |
| AM tuning range | 530-1610kHz |
| Sensitivity | 1.9uV (FM), 200uV (MW) |
| Supported Modes | AM, FM |
| Features | Digital |
| Audio Outputs | Stereo L/R |
| Color | Silver |
Design
The ST JX4 uses a quartz lock synthesizer tuning system, ensuring precise and stable frequency selection across both FM and AM bands.
Market
The tuner originally retailed for $845.75, as documented on an original receipt. It is currently available through collectors on eBay and Facebook Marketplace, with some units including service manuals, original boxes, and accessories. Owners report units in excellent working condition, with fully functional controls and low-noise performance.
eBay Listings
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