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-1000TW

 Pioneer Solid State AM/FM Stereo Receiver model SX-1000TW
Some Unique Features
FM front-end employing a field effect transistor to hear more stations more clearly.
By the use of FET in the FM radio frequency amplifier stage, design of nearly perfect FM front-end was achieved-free from cross modulation, free from drift, with better sensitivity, lower inherent noise, and high spurious rejection ratio.
 Integrated circuit (IC) employed in FM tuner assures outstanding capture ratio with high reliability.
In the FM intermediate frequency amplifier stage, integrated circuits are employed, resulting in an entirely different outstanding performance from that of IF stages hitherto designed, especially in the limiter characteristic and the capture ratio.

Multiplex circuitry (PMX) for maximum channel separation.
The accurate electronic switching circuitry is employed in the FM multiplex demodulator, insuring maximum separation with excellent tonal quality.

Unique muting circuitry permits the easiest tuning control.
The muting circuit provided in the FM tuner completely eliminates the FM inter-station noise which has hitherto been annoying the user in tuning.

High performance single ended push-pull (SEPP) output stage eliminates audio transformers and provides large output with true frequency fidelity.
The power amplifier employs the high-performance single ended push-pull circuitry in the output stage and the push-pull complementary circuitry in the driver stage, completely eliminating the distortion inherent transformers from the audio stage. Tripple diffused mesa transistors are adopted as the power transistors in the output stage for full-fidelity frequency response with large audio output power and least harmonic distortion.
 Full complement of inputs and outputs.
The inputs and outputs provided in the receiver include two pairs of Phono Mag inputs. When two turntables are connected to these inputs, the user is able to switch from one turntanble to the other any time  at will. Also, two pairs of loudspeaker output are included for switching between, or for permitting the simultaneous use of, two loudspeakers.

Electronic switch fully protects the precious power transistors.
The electronic switching circuitry employed in the power supply completely protects expensive power transistor even when the loudspeaker leads are shorted while the receiver unit is in use.

FM Tuner Section
Circuitry:  Front-end using FET and 4 gang variable air capacitor,  IF amplifier using 4 IC
Frequency Range:  87 - 108 MHz
IHF Usable Sensitivity:  1,7 µV
Image Rejection:  76 dB (at 98 MHz)
Signal-to-Noise Ratio:  65 dB (IHF Rating)
Capture Ratio:  1 dB (at 98 MHz)
Antenna Input:  300 Ω (balanced)
MPX Section
Circuitry:  Time-switching type de-modulator FM Mono Stereo Automatic selection
Channel Separation:  37 dB (at 1 kHz)
AM Tuner Section
Circuitry:  Superheterodyne
Frequency Range:  525 - 1605 kHz
IHF Usable Sensitivity:  20 µV
Image Rejection:  60 dB (at 1000 kHz)
Antenna Input:  Built-in Ferrite Loopstick antenna
Audio Section
Circuitry:  Single ended push-pull
Music Power Output (total IHF rating):
130 watts at 8 Ω
150 watts at 4 Ω
RMS Rated Power Output:  50 watts per channel at 8 Ω
Frequency Response:  20 Hz - 50 kHz (Over-all) ±1 dB
Harmonic Distortion:  less than 0,5% at 1 kHz rated output
Power Bandwidth:  15 Hz - 50 kHz (Aux)
Hum and Noise (at rated output):
Tape head :  better than 75 dB
Mag :  better than 80 dB
Aux :  better than 90 dB
Inputs Sensitivity/ Impedance (for rated output):
Magnetic Phono :  2,4 mV/50 k Ω
Ceramic Phono :  51 mV/90 k Ω
Tape head :  1,5 mV/120 k Ω
Tape Monitor :  200 mV/100 k Ω
Auxiliary:  200 mV/100 k Ω
Damping Factor:  25 (8 Ω, 1 kHz)
Output Terminals and Jacks:  Stereo headphone jack, Simultaneous tape Recording jacks, equipped with Tape Monitor switch, tape recording/playback jack (DIN standards)
Equalization Curves: 
Phono :  RIAA
Tape :  NAB
Tone Controls (each channel):
Bass :  boost 12 dB, cut 14 dB at 50 Hz
Treble :  boost 10 dB, cut 11,5 dB at 10 kHz
Low :  cut 6 dB at 50 Hz
High :  cut 10 dB at 10 kHz
Loudness Contour:  Switchable to On-Off boost 12 dB at 50 Hz, boost 6,5 dB at 10 kHz, with Volume control set at -40 dB
Tuner Section:  4 ICs; 1 FET; 15 Transistors; 17 Diodes
Audio Section:  27 Transistors; 17 Diodes and etc.
Power Requirements:  110, 112, 130, 220 V and 240 V (switchable) 50/60 Hz
Power Consumption:  285 VA, 255 W (max)
Dimensions (W x H x D):  405 x 137 x 350 mm (15-15/16" x 5-3/8" x 13-3/4")

Weight [without/with package]:  10,6 kg (23 lb) / 13,3 kg (29 lb)

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