Pioneer SX 850 (1976–1977)
A solid-state AM/FM stereo receiver from Pioneer’s premium 50 series, produced at the height of the high-fidelity era.
Overview
The Pioneer SX 850 is an AM/FM stereo receiver manufactured from 1976 to 1977. It belongs to Pioneer’s 50 series lineup and was positioned as one of their higher-end models during that period, though not the flagship. The SX-880 succeeded this model in the product line. Known for its robust build and warm sound signature typical of early solid-state Pioneers, the SX 850 features a super-quiet phono equalizer and strong FM selectivity and sensitivity.
Specifications
| Product type | AM/FM stereo receiver |
| Production years | 1976 to 1977 |
| Watts Per Channel | 65 watts per channel, min RMS at 8 ohms |
| Frequency response | 10Hz to 50kHz |
| Dimensions | 526.6 x 173 x 411.5mm |
| Weight | 19.1kg |
| Accessories | FM T-type antenna |
| Circuit | all-stage direct-coupled OCL circuit |
Design
The receiver uses an all-stage direct-coupled OCL circuit design, contributing to its clean signal path and warm audio character. It includes a super-quiet phono equalizer and delivers outstanding FM selectivity and sensitivity.
Context
While not the top model in Pioneer’s range, the SX 850 was considered one of their higher-end offerings in the mid-1970s. It was part of the 50 series and was later replaced by the SX-880.
Market
Units have been listed for $500, including examples sold for parts or with cosmetic flaws such as peeling wood vinyl. Some units exhibit channel imbalance, with one channel functioning properly while the other does not. Restoration services typically include a full service check, cleaning of controls and switches, and recapping of the power supply board.
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