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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 SA-500A (1972)

 Pioneer model SA-500A (1972 -1974) a budget-price sollid-state stereo integrated amplifier with musical power of up to 44 watts and wide frequency response.

Pioneer's low-priced stereo components are designed and manufactured to meet the special demands of the man who is building his system of hi-fi components on a budget. While usually offering a little less in power and versatility, these Pioner units spare nothing in terms ofquality engineering and performance. The SA-500A integrated amplifier is no exception. Using long-life, low-noise silicon transistors throughout, the SA-500A is featured by a very wide frequency response and superb signal-to-noise ratio. It gives you music power output of up to 44 watts (at 4 ohms), and may be used with up to two tape decks, two turntables, a tuner and one other auxiliary source. The SA-500A can also drive up to two sets of speaker systems simultaneously or separately. And it's priced to fit into any stereo budget.
 Direct Coupling Preamplifier Section
So that its dynamic range is very wide, the equalizer circuit of the SA-500A uses two-stage direct coupling negative feedback circuit with low-noise silicon transistors. For professional tone control, the unit offers click-stop-type individual bass and treble controls that allow you to increase or decrease the audio signal delivered to the amplifier in measured steps. Thus, signals delivered from the unit sound the way you want them to.

Power Amplifier Section
The power amplifier section of the SA-500A is equipped with quasi-complimentary single ended push-pull circuit to ensure distortion-free sound reproduction and a wide frequency response. Music power output of the unit is 44 watts (measured at 4 ohms), more than you'll ever need to fill your music room with spectacular soild sound. The SA-500A can handle up to two different pairs of speaker systems, either separately or simultaneously, giving you the extra versatility of playing a small set of speakers in a room adjacent to your regular music listening room. The unit also lets you easily compare noe set of speakers with another, or lets you select the appropriate speaker unit when systems are placed in different rooms.
  Two Phono Inputs
The SA-500A is equipped with all necessary input terminals to allow you to built a perfect components system. It has two sets of phono input terminals in addition to a tuner  and an auxiliary terminal. You may, if you wish, connect two turntables simultaneously. Or you may also use the jacks provided to compare two different cartridges or turntables.

Two Tape Deck Terminals
The SA-500A has two pairs of Tape Rec and Monitor terminals so that you may operate two tape decks simultaneously choosing from an open-reel deck, a cassette deck or an 8-track cartridge tape deck. This feature permits easy tape-to-tape duplicating.

Specifications
Music Power Output (IHF): 44 watts at 4 Ω;  36watts at 8Ω
Continuous Power Output (each channel driven):  16 watts/16 watts at 4Ω;  13 watts/13 watts at 8Ω
Continuous Power Output (Both Channel Driven):  12 watts + 12 watts at 4Ω;  10 watts + 10 watts at 8Ω
Harmonic Distortion:  Less than 0,5% (continuous power output)
IM Distortion:  Less than 0,7% (continuous power output)
Power Bandwidth (IHF):  20 to 40,000 Hz (8Ω, 0,5% THD)
Frequency Response (Aux):  30 to 50,000 Hz +1 dB  -2 dB
Input Sensitivity/Impedance (1kHz for rated output):
Phono 1 Mag : 2,5 mV/50 kΩ
Phono 2 Mag : 2,5 mV/50 kΩ
Tuner : 200 mV/100 kΩ
Aux 1, 2 :  200 mV/100 kΩ
Tape Monitor 1, 2 : 200 mV/100 kΩ
Recording Output:
Tape Rec 1, 2  (pin jack) : 200 mV
Tape Rec (DIN connector) : 30 mV
Controls:
Bass : -11 dB,  +12 dB ( at 100 Hz)
Treble : -10 dB,  +9,5 dB (at 10 kHz)
Loudness Contour : +10 dB/100 Hz;  +5,5 dB/10kHz (with volume control set at -40 dB)
Phono Equalization Curve:  RIAA standard
Hum and Noise (IHF):
Phono : more than 75 dB
Tuner, Aux : more than 90 dB
Channel Separation (IHF):
Phono : more than 50 dB
Tuner, Aux : more than 55 dB
Speaker Impedance : 4 Ω to 16 Ω
Damping factor:  40 (8Ω, 1kHz)
Power Requirements:  110, 120, 130, 220, 240 V AC, 50/60 Hz
Power Consumption:  75 watts Max
Dimensions (W x H x D):  330 x 118 x 316 mm ( 13" x 4-5/8" x 12-7/16")
Weight:  5,5 kg (12 lb 2 oz ) net

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