Pioneer SX-690
A mid-tier AM/FM stereo receiver from Pioneer's 1970s SX series — 30 watts per channel, the silver-faceplate styling of the era, sitting between the smaller SX-580 and the higher-power SX-780/880 in Pioneer's mid-1970s lineup.
Overview
The SX-690 occupies the middle of Pioneer's 1976-1978 SX receiver lineup. Above it sit the SX-780, SX-880, SX-980, and the flagship SX-1080/1250; below it the SX-450, SX-550, SX-580, SX-650. The SX-690 was Pioneer's value-priced offering — enough power for a small-to-medium listening room, full feature set for the era (phono MM input, dual tape monitors, headphone jack, speaker A/B switching), and the company's standard silver brushed-aluminum cosmetic treatment.
For collectors and restorers, the SX-690 is a reasonable target — easier to find in clean condition than the flagship SX-1250, less expensive, and shares many of the same internal components with its larger siblings.
Specifications
| Type | AM/FM stereo receiver |
| Power | 30 W/ch RMS, both channels driven, 8Ω |
| Frequency response | 20 Hz – 30 kHz |
| THD | 0.2% at rated power |
| S/N ratio | 80 dB (Aux) |
| Phono input | MM, 2.5 mV / 50 kΩ |
| FM sensitivity | 1.9 µV IHF |
| Speaker switching | A/B with parallel/series options |
Applications and Legacy
Mid-1970s home stereo systems with bookshelf or floor-standing speakers. Working examples trade for $150-300 in clean condition. Common service points: dial-lamp replacement, electrolytic capacitor refresh, switch contact cleaning, occasionally output transistor replacement if the original units have drifted.
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Related Models
- Pioneer QX-949A (1978)
- Pioneer SA-8800II
- Pioneer SX-1050 (1978)
- Pioneer SX-1080 (1978)
- Pioneer SX-1500T (1978)
- Teac A-460 (1975)
- Akai AM-16 (1975)
- Realistic STA-47 (1976)
- Teac A-3300 (1972)
- Teac A-3300S (1975)