Pioneer SX 3700 (1979-1981)
Specifications
| Feature | Specification |
| Year of Production | 1979-1981 |
| Power Specifications | 45W per channel (8Ω, 20Hz-20kHz, 0.3% THD) |
| Impedance | 4-16Ω |
| Sensitivity | Unknown |
| Key Features | Quartz PLL synthesized tuning, 5-gang tuning capacitor, FET front end, dual power supply, loudness contour, tape dubbing, 4 pairs of speaker outputs |
Historical Significance
The Pioneer SX-3700 was released between 1979 and 1981. It sits in the middle of Pioneer's SX-x800 series, a line that pushed analog performance just before digital began to take hold. No gimmicks here, just precision-tuned circuitry built to last. It has quartz-locked tuning and a dual power supply, and many still consider its broadcast clarity and amplifier control unmatched in its class.
Sound Signature
The SX-3700 sounds clean and articulate, and it stays composed even at volume. It puts out 45 watts per channel. That won't scare anyone, but the bass is tight, the highs are crisp, and the tonal balance is neutral, warmed just slightly by analog grace. It never feels clinical. FM reception is a particular strength, thanks to the 5-gang tuning cap and FET front end, which pull in weak stations with rare clarity.
Maintenance and Restoration Tips
These receivers were built to endure, but time takes its toll. The most common problems are cranky volume pots and input selectors. Cleaning with contact spray often brings them back. Aging electrolytic capacitors are due for replacement, especially if the unit has been dormant. The tuning string mechanism can slip or bind after decades, and a careful alignment restores smooth tracking. The display bulbs are long gone by now, but modern LED equivalents are simple to fit and won't yellow or burn out in a year.
Collectibility and Market Value
- Market Value: $150-$300 depending on condition and cosmetic appearance
- Collectibility Rating: 7/10
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