Pioneer SX-424 Solid State Stereo Receiver Japan 1974

A charming receiver from the blue area. The Pioneer SX-424 is a classic stereo receiver delivering warm analog sound and solid performance. With phono, mic, and auxiliary inputs, this vintage unit is ideal for audiophiles and vinyl enthusiasts looking for quality and charm. Features: 12W per channel continuous power output (up to 25W pulsed).
A medium-powered, budget-priced AM/FM solid state stereo receiver with special features for sensitive FM tuning and wide frequency response. Pioneer's SX-424 solid state stereo receiver, with AM/FM reception, is proof positive that stereo on a limited budget doesn't have to mean limited stereo sound. In a handsome package of quality circuitry and reasonable price, the SX-424 offers up to 50 watts of music power (at 4 ohms), very sensitive FM reception, a wide linear type dial scale for fine FM tuning, and highly respectable specifications both for the FM tuner section and the audio section. It's a versatile unit, too- because you can use it with almost all music sources available today, including records, tape, FM and microphone. Best of all, it's Pioneer-made, which means that, for its price, there is probably nothing available today that can compare with its quality.
This item is in excellent condition, completely cleaned and restored with brand new lights behind the front panel.

Specifications

Manufacturer: Pioneer
Model: SX-424
Serial number: S81600200
Type: Receiver
Years of manufacture: 1972 - 1974
Made in: Japan
Color: Front silver, wooden cabinet
Power consumption: 90 W max
Dimensions: 431 x 146 x 347 mm (WxHxD)
Weight: 7.5 kg
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

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 dBű

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

Tags: Pioneer, SX-424, Receiver, Amplifier, Japan, Vintage, Hifi, Audio