Pioneer SX-939 Receiver

Pioneer SX-939
The SX-939 was introduced in 1974 - 1975. Rated at 70 watts RMS per channel into 8 ohms. Features, two bass and two treble controls, tone off/on, two tape in/outputs, tape duplicator switch, Dolby NR adaptor on/off, two head phone outputs, low and high filters, right and left mic inputs. FM muting and other features.

More pictures and specifications after the break.

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Specifications:

Power Output: 75 watts per channel RMS into 8 ohms, 100 watts into 4 ohms.
Harmonic Distortion: Less than 0.3%
Intermodulation Distortion: Less than 0.3%
Damping Factor: >45
Hum and Noise: >-110dB
Frequency Response: 7Hz to 100kHz

FM Sensitivity: 1.8uV
FM Signal to Noise Ratio: 70dB
IF Rejection: 100dB
Spurious Rejection: 100dB
Harmonic Distortion Mono: <0.2%
Harmonic Distortion Stereo: <0.4%
Stereo Separation: >40dB