Sony st-s333esj (1990-1993)
FM/AM stereo tuner released in 1993 with synthesizer tuning, AM stereo decoding, and comprehensive service adjustments.
Overview
The Sony ST-S333ESJ is an FM/AM stereo tuner released in 1993. It is part of Sony's 333 series, following the ST-S333ESG (1989) and ST-S333ESA (1991). The unit features a synthesizer system for precise tuning and includes a wireless remote control (RM-J301). It uses a pure circuit design that stops microcomputer operation after channel selection to reduce interference.
Specifications
| Receiving frequency band (FM) | 76.0 MHz to 90.0 MHz |
| Receiving frequency band (AM) | 531 kHz to 1602 kHz |
| Power consumption | 20W |
| External dimensions | Width 470 × Height 100 × Depth 375 mm |
| Weight | 7.0 kg |
| Original price | ¥55,000 (1993) |
Design
The ST-S333ESJ uses radial power supply routing with single-point grounding to minimize noise. It features a solid aluminum tuning knob instead of a variable capacitor and includes relays for antenna and IF band switching. The circuit board layout and configuration are identical to the ST-S333ESA, with front-end shielding grounded to the chassis. Key ICs include the LA1235 for FM IF/detection, MC13022DW for AM stereo decoding, and CX-7925B for PLL. The unit has extensive adjustment points for FM tuning, tracking, IF distortion, stereo separation, muting, S-meter, and AM performance.
Context
The overseas model equivalent is the ST-S707ES. The 333 series was actively purchased through model updates in the 1980s, with the ESJ representing the final iteration in this line.
Market
Common issues include failure of the 0.1F/5.5V memory backup capacitor causing station memory loss, swelling of the 330uF/50V power supply capacitor, and hairline cracks in solder joints on ground bars. FM reception problems—such as stereo lamp flickering and audio muting—are often due to FM tuning point drift. Display window fading and contact issues with PLL detection trimmer capacitor CT271 are also reported.
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