Amplituner Japan 1972 Pioneer SX-424

Manufacturer: Pioneer
Model: SX-424
Type: Receiver
Years of manufacture: 1972 - 1974
Made in: Japan
Color: front silver, wooden cabinet
Remote control: no
Power consumption: 90 W max.
Dimensions: 431 x 146 x 347 mm (WxHxD)
Weight: 7.5 kg
Original price approx.: 752 DM

Connections

Number of inputs:
Phono MM: 3 mV / 50 kOhm
Microphone (6.3mm jack): 6.5 mV / 50 kOhm
Aux: 180 mV, 100 kOhm
Tape Play: 180 mV / 100 kOhm
Tape Play (DIN): 180 mV / 100 kOhm

Antenna (FM: 75, 300 Ohm, MW: 300 Ohm).
Number of outputs:
Tape Rec: 180 mV
Tape (DIN): 36 mV

Headphones (6,3mm jack)
2 pairs of loudspeakers

Technical Data

Amplifier

Continuous power (at distortion):
8 Ohm: 2x 12 W
4 Ohm: 2x 13 W

Dynamic power:
8 Ohm: 37 W
4 Ohm: 50 W
Total harmonic distortion: 1
Attenuation factor: 40 (8 Ohm, 1 kHz)
Frequency response:
Phono, RIAA: 20 - 20'000 Hz
High level: 20 - 70'000 Hz, ± 1 dB
Signal-to-noise ratio:
Phono, RIAA: 75 dB
High level: 85 dB
Tone control:
Bass: ± 9 dB at 100 Hz
Treble: + 6 dB, - 9 dB at 10 kHz
Loudness: + 9.5 dB at 100 Hz, + 5.5 dB at 10 kHz
Subsonic:
High Filter:
Mute:

Tuner

Reception: FM, MW
Frequencies:
FM: 88 - 108 MHz
MW: 525 - 1605 kHz
Input sensitivity:
FM: 2.3 µV
MW: 15µV

All other specifications for VHF
Frequency response: 20 - 15'000 Hz, + 0 dB, - 1 dB
Distortion factor:

FM: 0.6% (mono), 0.8% (stereo).
Signal-to-noise ratio:
FM: 65 dB
AM: > 50 dB

Channel separation: > 40 dB (1 kHz)
selectivity: > 45 dB
Common mode selection: 3.5 dB
Spurious attenuation: > 70 dB (98 MHz)
Image frequency attenuation:
FM: > 50 dB (98 MHz)
AM: > 45 dB (1000 kHz) IF attenuation:

FM: > 80 dB (90 MHz)
AM: > 35 dB
AM suppression: 45 dB

Special Features

microphone front 6,3mm jack