Pioneer SX-3900 (1980–1981)
A top-of-the-line Fluoroscan AM/FM stereo receiver from Pioneer's transitional digital-era lineup.
Overview
The Pioneer SX-3900 is an AM/FM stereo receiver built in Japan from 1980 to 1981. It is the peak of Pioneer's Fluoroscan series. Pioneer marketed it as the big brother to the SX-3800 and positioned it as the flagship Fluoroscan model, right as high-fidelity audio was shifting from analog to digital. It combined high power output with tuning precision that was advanced for its time.
Specifications
| Product type | AM/FM stereo receiver; Fluoroscan receiver; top of the line Fluoroscan receiver |
| Production years | 1980 - 1981 |
| Power output | 120 watts per channel into 8Ω (stereo) |
| Frequency response | 7Hz to 80kHz |
| Total harmonic distortion | 0.005 |
| Made in | Japan |
| Original price | about $800.00 |
Design
The SX-3900 uses a non-switching amplifier design and digital, quartz-servo locked tuning.
Context
The SX-3900 replaced the SX-3800 as Pioneer's top Fluoroscan receiver. It showed up at the end of the analog era and started digital integration in Pioneer's high-end receivers.
Market
Common service work on the SX-3900 includes restoration, retransistor work, and recapping. Units described as "fully serviced" turn up on the market, but there is no current pricing data. Forum discussions focus on its sound quality and on recapping, which age makes a practical necessity.
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