What is stereo?




There are now two system of high fidelity, monophonic (monaural) and stereophonic. Monophonic is a system that starts from one microphone and is fed through a single high fidelity set. Stereophonic is a double system. Two separate microphones are placed at different sides of the orchestra and two different systems are used to keep the two signals or channels separated. Two separate speakers are used, placed on different sides of you room. Stereo is much like 3-D photography, two slightly different sound reach your ears giving you a new dimension in sound.




H.H. Scott '59





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)

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