The Pioneer SX-939 Receiver was available starting in 1974. Perhaps its most favored feature, it sufficiently rattled windows at the 12 o’clock position while only rated at 75 watts RMS per channel into 8 ohms. The Pioneer SX-939 stereo receiver was the little brother to the SX-1010 in both 1974 and 1975 and had a list price of $600.00. This was a classic silver face units sporting the walnut veneers and corners and the classic blue meters. Weighing in at about 40 pounds this stereo was a favorite among pioneer enthusiasts that year. The  Pioneer …