Pioneer SX-939

Data

General

• Manufacturer: Pioneer
• Model: SX-939
• Type: Receiver
• Years of manufacture: 1974 - 1976
• Made in: Japan
• Color: front silver, wooden cabinet
• Remote control: no
• Power consumption: 470 W
• Dimensions: 520 x 175 x 420 mm (WxHxD)
• Weight: 18,5 kg
• Original price approx.: 2'385 DM

Connections

• Number of inputs:
  • Phono MM 1, 2: 2.5 mV, 50 kOhm, 250 mV max.
  • Microphone (6,3mm jack): 2 mV, 50 kOhm
  • Aux: 150 mV, 70 kOhm
  • Tape 1, 2 Play: 150 mV, 70 kOhm

Tape Play (DIN): 150 mV, 70 kOhm NR Adapter In: 150 mV, 70 kOhm Main In: 1 V, 50 kOhm

• • Antenna (FM: 75, 300 Ohm, MW: 300 Ohm).
• Number of outputs:
  • Tape Rec 1, 2: 150 mV
  • Tape (DIN): 30 mV, 80 kOhm

NR Adapter Out: 150 mV

• • Pre Out: 1 V, 1 kOhm, 4 V max.
  • Headphones (6.3mm jack)
  • 3 speaker pairs

Technical Data

Amplifier

• Continuous power (at distortion):
  • 8 Ohm: 2x 70 W (RMS, 20 - 20'OOO Hz).
  • 4 Ohm: 2x 80 W
• dynamic power:
  • 8 Ohm:
  • 4 Ohm:
• Total harmonic distortion: < 0.05 %
• Attenuation factor: 50 (8 Ohm, 1 kHz)
• Frequency response:
  • Phono, RIAA: 30 - 15'000 Hz, ± 0,3 dB
  • High level: 10 - 40'000 Hz, + 0 dB, - 1 dB
• Signal-to-noise ratio:
  • Phono: 70 dB
  • Microphone: 65 dB
  • High level: 95 dB
• Tone control:
  • Bass Main: ± 10 dB at 100 Hz

Bass Sub: ± 5 dB at 50 Hz Treble Main: ± 10 dB at 10 kHz Treble Sub: ± 5 dB at 20 kHz

• Loudness: + 8 dB at 100 Hz, + 4 dB at 10 kHz
• Low Filter: - 8 dB at 50 Hz, - 6 dB / octave
• High Filter: - 9 dB at 10 kHz, - 6 dB / octave
• Subsonic: no
• Mute: - 20 dB

Tuner

• Reception: FM, MW
• Frequencies:
  • FM: 88 - 108 MHz
  • MW: 525 - 1605 kHz
• Input sensitivity:
  • FM: 1.8µV

MW: 15µV

• All other specifications for VHF
• Frequency response: 20 - 15'000 Hz, + 0,2 dB, - 2 dB
• Distortion factor:
  • Mono: < 0.2 %

Stereo: < 0.4

• Signal-to-noise ratio:
  • Mono: 70 dB

Stereo: 65 dB

• Channel separation: 40 dB (1 kHz)
• selectivity: 80 dB
• Co-wave selection: 1.0 dB
• Spurious wave selection: 100 dB
• Image frequency attenuation: 85 dB
• IF attenuation: 100 dB
• AM suppression: 55 dB

Special Features

• Pre- and power amplifier can be separated (Main In/Pre Out)

Remarks

• Black version:
• Pioneer SX-9930

• Other models in the same series:
• Amplifier:
• Pioneer SA-500 A
• Pioneer SA-6200
• Pioneer SA-7100
• Pioneer SA-8100
• Pioneer SA-9100

• [[Tuner:
• Pioneer TX-500 A
• Pioneer TX-6200
• Pioneer TX-7100
• Pioneer TX-8100
• Pioneer TX-9100

• [[Receiver:
• Pioneer SX-434
• Pioneer SX-535
• Pioneer SX-636
• Pioneer SX-737
• Pioneer SX-838
• Pioneer SX-939
• Pioneer SX-1010

• Tape Decks:
• Pioneer CT-3131 A
• Pioneer CT-4141 A
• Pioneer CT-5151
• Pioneer CT-F 7171

• Coil Devices
• Pioneer RT-1020

• Turntables:
• Pioneer PL-10
• Pioneer PL-12 D
• Pioneer PL-15 D
• Pioneer PL-A 45 D
• Pioneer PL-51 A
• Pioneer PL-71

Pictures

• Image: Pioneer SX-939

• Excerpt from brochure: Pioneer SX-939