Pioneer SX-424

 The SX-424 is a medium-powered, budget-priced AM/FM solid state stereo receiver with special features for sensitive FM tuning and wide frequency response.

Pioneer SX-424 is proof positive taht 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 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.

Specifications

Amplifier Section

Music Power Output (IHF):  50 W at 4 Ω;  37 W at 8 Ω

Continuous Power Output (1 kHz each channel driven):

18 W / 18 W at 4 Ω

14 W / 14 W at 8 Ω

Continuous Power Output (1 kHz both channel driven):

13 W + 13 W at 4 Ω

12 W + 12 W at 8 Ω

Total Harmonic Distortion:  less than 1% (continuous power output)

Intermodulation Distortion:  less than 1% (continuous power output)

Power Bandwith (IHF):  20 Hz to 45 kHz (8 Ω, T.H.D. less than 1%)

Frequency Response:  20 Hz to 70 kHz ±3 dB

Speakers output Impedance:  4 to 16 Ω

Damping Factor:  40 (8 Ω, 1 kHz)

Input Sensitivity/Impedance:

Phono Mag :  3 mV/50 k Ω

Mic :  6,5 mV/50 k Ω

Aux :  180 mV/100 k Ω

Tape Monitor :  180 mV/100 k Ω

Tape Monitor (DIN) :  180 mV/100 k Ω

Recording Output:

Tape Rec (Pin Jack) :  180 mV

Tape Rec (DIN connector) :  36 mV

Bass Control :  -9 dB, +9 dB / 100 Hz

Treble Control :  -9 dB, +6 dB / 10 kHz

Equalization Curve (Phono):  RIAA standard

Loudness Contour:  +9,5 dB/100 Hz; +5,5 dB/10 kHz (with volume control set at -40 dB position)

Hum and Noise (IHF): 

Phono :  more than 75 dB

Aux :  more than 85 dB

FM Tuner Section

Requency range:  88 MHz to 108 MHz [87,5 MHz to 108 MHz, FTZ approved]

Usable Sensitivity (IHF):  2,3 µV

Capture Ratio (IHF):  3,5 dB

Image Rejection:  more than 50 dB (98 MHz)

IF Rejection:  more than 80 dB (90 MHz)

Spurious Rejection:  more than 70 dB (90 MHz)

AM Suppression:  45 dB

Signal-to-Noise Ratio:  65 dB

Harmonic Distortion:

Mono :  less than 0,6% (100% mod.)

Stereo :  less tahn 0,8% (100% mod.)

Tuning Indicator:  Signal strength type

Stereo Separation:  more than 40 dB (1 kHz)

Sub Carrier Suppression:  more than 35 dB

Noise Filter:  Switchable to On-Off

Antenna Input:  300 Ω balanced; 75 Ω unbalanced

De-emphasis Selector:  50 µS (FW model only)

AM Tuner Section

Frequency Range:  525 kHz to 1605 kHz

Usable Sensitivity (IHF):  15 µV

Image Rejection:  more than 45 dB (1,000 kHz)

IF Rejection:  more than 35 dB

Signal-to-Noise Ratio:  more than 50 dB

Antenna: Built-in ferrite loopstick antenna

Miscellaneous

Semiconductors:  Transistors 30, Diodes 24; FETs 1

Power

Requirements :  120 V 50 Hz; 220 V 50/60 Hz, or 110, 120, 130 220, 240 V (switchable) 50/60 Hz

Consumption:  90 W max

AC Outlets:  1 Unswitched, 1 switched

Dimensions (W x H x D):  431 x 146 x 347 mm (16-31/32" x 5-3/4" x 13-21/32")

Weight (net): 

120 voltage model :  7,5 kg (16 lb 8 oz)

220 voltage model:  7,9 kg (17 lb 6 oz)