Pioneer SX ? 939 receiver. Classic Vintage. Fully revitalized.
In 1937 Nozomu Matsumoto created the first magnetoelectric speaker in Japan, and a year later, in Tokyo, he registered the company under the name Fukuin Shokai Denki Seisakusho. In 1961, the company’s name was changed to Pioneer Electronic Corporation. However, the breakthrough came in 1962, when the company entered the Tokyo Stock Exchange and created the world’s first stereo system with speakers in separate housings. Four years later, Pioneer opened branches in the USA and in Europe. In 1978, the company created one of the best-known and most powerful receivers in its history SX-1980. Pioneer can also be proud of great successes in the world of auto-moto, as it introduced in 1975 the world’s first automotive stereo subassembly, then in 1984 a CD player and GPS navigation in 1990. The company also played a major role in the development of DVDs, plasma TVs and technologies Organic LED display (OLED). The company is currently part of Pioneer & Onkyo Corporation.
The receivers marked with the SX symbol are Pioneer’s flagship products from the 70s. They are characterized by a beautiful, warm and rich sound, as well as extremely solid finish. Still, it is the SX-X50 series receivers that boast the highest quality among Pioneer’s models of that era.
Pioneer SX-939 is a versatile high power FM/ MW stereo receiver. It has a parallel push-pull OCL power amplifier with less than 0.3% total harmonic distortion, brand new PLL MPX circuit, frequency linear 4-gang capacitor, and a newly developed AM integrated circuit.
The enclosure has been completely revitalized, it is made of American cherry wood, the wood finishing is Chinese oil produced from natural oils. Potentiometers are in perfect condition. The metal elements of the enclosure have been cleaned and pained using the automotive wet painting technique. The device has been fully reviewed and serviced, it has new aluminum legs.
Collector’s item. The device is in perfect condition.
New blue illumination of the front panel.
– power: 2 x 70W at 8Ohm, stereo
– frequency response – 10Hz – 40kHz
– total harmonic distortion: 0.3%
– input sensitivity: 2mV (microphone), 2.5mV (MM), 150 mV (DIN), 150 mV (line)
– signal-to-noise ratio: 70dB (MM), 95dB (line), 65 dB (mic)
– output sensitivity – 150 mV (line), 30 mV (line), 1 V (preamplifier output)
– weight – 19 kg
– damping factor – 45
– impedance 4 – 8 Ohm
– dimensions – 52cm x 17,5cm x 37cm (width x height x depth)
– year of production 1974/76
– made in Japan