Sony ST-JX3
A stereo FM/AM tuner from Sony with precise tuning and visual signal indicators.
Overview
The Sony ST-JX3 is an AM/FM stereo tuner made by Sony. It was priced at ¥32,000 around 1981 and built for high-fidelity radio reception. It measures 430 mm wide, 55 mm high and 340 mm deep, and weighs 3.4 kg. Its tuning features are aimed at clearer, more stable signal reception.
Specifications
| Original price | ¥32,000 (around 1981) |
| External dimensions | Width 430x Height 55x Depth 340 mm |
| Weight | 3.4kg |
| Practical sensitivity | 1.8 μV (IHF), 10.3 dBf (new IHF) |
| Stereo distortion factor | 0.12% |
| Effective selectivity | 80dB |
| Spurious interference ratio | 75dB |
| Separation | 50dB |
| Power consumption | 8W |
Design
The ST-JX3 uses an Acute Servo Lock method to lock onto the best tuning point within a narrow range, which keeps reception stable. SENS switches and CAL TONE circuits raise real sensitivity on both FM and AM, so weak signals come in clearer. The FM IF stage has a uniphase filter. The AM section gets high-fidelity reception from a wider bandwidth. A litmus dial pointer changes from red to green when the tuner is on station, and a 3-point LED signal indicator sits alongside it. There is also a low-pass filter and a beat cut filter.
Market
The ST-JX3 shows up in current listings on eBay and Mercari. Service manuals are for sale through various online sources, including vintageaudiostore.com and eBay.
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