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-434

Stereo Receiver with high-performance tuner and direct-coupled OCL power amplifier.
There is a wide range of Pioneer stereo receivers to satisfy the needs and demands of virtually every audio fan. One of the latest, the SX-434, is specifically designed for those who insist on low distortion but who feel that paying for power they don't need is wasteful. The SX-434 has more than enough power, yet is priced to appeal to budget-conscious music lovers. Its FM section provides an excellent 1,9 µV sensitivity (IHF), a capture ratio of 1,0 dB (IHF) selectivity of 60 dB (IHF), and superb stereo separation of more than 30 dB over a 50 to 10,000 Hz range. Advanced electronic circuitry throughout includes a low-noise FET and a frequency-linear 3-gang variable capacitor in the FM front end, exclusive IC and phase-linear ceramic filters in the FM IF section and more. The phono equalizer in the SX-434 is high-fidelity all the way, with RIAA equalization of less than ±1 dB deviation. The power amplifier circuitry is the pure complementary direct-coupled OCL type with wide response and power bandwidth. The SX-434 produces 15 W + 15 W continuous RMS power (both channels driven at 8 Ω) with harmonic distrotion of less than 0,8% over 40 to 20,000 Hz bandwidth. This is enough to drive two pairs of stereo speaker systems individually or simultaneously.
High -Performance FM Front End
The Pioneer SX-434 features top-class FM capabilities. The low-noise FET and frequency linear 3-gang variable capacitor in the FM front end contribute to the excellent sensitivity of 1,9 µV (IHF). Improved image and spurious rejection characteristics and a high signal-t-noise ratio in performance.
FM IF Section with IC and Ceramic Filters
State-of -the -art. Techniques are also employed in the FM IF amplifier of the SX-434. phase-linear caermic filters and an advanced IC afford a high selectivity of 60 dB (IHF) and a capture ratio of 1,0 dB (IHF), figures you'd expect from a tuner or receiver in a higher price category.
FM Muting Switch
Annoying inter-station noise can be cancelled during tuning by the handy FM muting switch.
Exclusive IC-Equipped AM Section
Maximum fidelity and noise-free listening can be enjoyed in the AM band with the IC-equipped AM section of exclusive Pioneer design.
RMS Continuous Power 15 x 2
The pure-complementary direct-coupled OCL design of the power amplifier section in the SX-434 assures wide frequency response wide power bandwidth and satisfactorily low distrotion. Continuous RMS power over the 40 to 20,000 Hz frequency bandwidth (measured with both channel driven into 8 ohms loads) is a stable 15 W + 15 W with less than 0,8% harmonic distortion.
Two-pair Stereo Speaker Facilities
With its ample power provisions, the SX-434 drives up to two independent pairs of stereo speaker systems, one pair at atime or both together. Ideal for powering those remote speaker.
Precise RIAA Equalization
The two-stage direct-coupled NF (Negative Feedback) design of the phono equalizer in the SX-434 enables audio reproduction of records within ±1 dB deviation from the RIAA characteristic curve.
Click-Stop Tone Controls
The bass and Treble tone controls are the click-stop type for convenience in adjustment.
Other Features
The control capabilities of the SX-434 are ideal for the average hi-fi set-up; it handles a turntable, tape deck, microphone, Aux and has an output jack for stereo headphone. The provided loudness contour switch enhances frequency response at low-volume levels.

Amplifier Section
Continuous Power Output
20 Hz to 20,000 Hz (both channel driven) :  12 watts + 12 watts at 8 Ω
40 Hz to 20,000 Hz (both channel drivem) : 15 watts +15 watts  at 8 Ω and 4 Ω
1 kHz (both channel drivem) : 16 watts +16 watts  at 8 Ω;  18 watts +18 watts  at 4 Ω
Harmonic Distortion: 
Continuous  power output :  less than 0,8%
1 W +1 W, power output:  less than 0,1%
Intermodulation Distortion:
Continuous  power output :  less than 0,8%
1 W +1 W, power output:  less than 0,1%
Power Bandwidth (IHF, both channel driven) :  10 Hz to 70,000 Hz (T.H.D. 0,8%)
Speaker:  A, B, A + B (4 to 16 ohms)
Headphone :  4 to 16 ohms
Damping Factor:  more than 25 (1 kHz, 8 0hm)
Residual Hum and Noise:  less than 0,5 mV (8 Ω, pre & power amplifier)
Input Sensitivity/Impedance:
Phono :  2,5 mV/50 k Ω
Phono Overload Level (RMS/P-P) :  100 mV/280 mV
MIC :  10 mV/90 k Ω
AUX :  150 mV/80 k Ω
Tape PB :  150 mV/80 k Ω
Tape PB (DIN connector):  150 mV/80 k Ω
Output Level/Impedance:
Tape REC :  150 mV
Tape REC (DIN connector) :  30 mV/80 k Ω
Frequency Response
Phono (RIAA equalization) :  30 Hz to 15 kHz ±1 dB
Aux, Tape PB :  30 Hz to 25 kHz ±1 dB
Tone Control:
Bass :  +9 dB -8 dB at 100 Hz
Treble :  +5 dB -7 dB at 10 kHz
Loudness Contour :  +10 dB at 100 Hz ; +6 dB at 10 kHz
Hum and Noise (IHF, Short-Circuited A Network):
Phono :  more than 70 dB
MIC :  more than 65 dB
Tuner, AUX, Tape PB :  more than 90 dB
Fm Tuner Section
Usable Sensitivity (IHF):  1,9 µV
Capture Ratio (IHF): 1,0 dB
Selectivity (IHF):  60 dB
Signal-to-Noise Ratio:  70 dB
Image rejection:  60 dB (98 MHz)
IF Rejection:  90 dB (98 MHz)
Spurious Rejection:  75 dB
Am Suppression:  50 dB
Total Harmonic Distortion
Mono :  less than 0,2 %
Stereo :  less than 0,4 %
Frequency Response
20 Hz to 15 kHz, +0,2 dB, -2,0 dB
50 Hz to 10 kHz +0,2 dB, -0,5 dB
Stereo Separation:
More than 40 dB at 1 kHz
More than 30 dB from 50 Hz to 10 kHz
Sub Carrier Suppression:  40 dB
Antenna Input:   300 Ω balanced and 75 Ω unbalanced
Muting:  On-Off
AM Tuner Section
Sensitivty:  300 µV/m (IHF, ferrite antenna); 15 µV (IHF, ext. Antenna)
Selectivity:  35 dB
Signal-to-Noise Ratio:  50 dB
Image Rejection:  40 dB
IF Rejection:  50 dB
Semiconductors:  27 Transistors; 1 FET; 3 Ics; 13 Diodes
Requirements:  110/ 120/ 130/ 220/ 240 V 50/60 Hz
Consumption:  75 watts / 110 watts
Dimensions (W x H x D):  430 x 140 x 347 mm (16-15/16' x 5-1/2' x 13-21/32")
Weight (net):   8,1 kg (17 lb 14 oz)

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