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

Audio Research SP-8

 The single greatest requirement of a preamplifier is to amplify the given signal input without adding or subtracting musical information. This extremely complex, intricately defined, highly dynamic signal creates heavy demands on a preamplifier. Only Audio Research preamplifiers so accurately meet these demands that they transmit the listener beyond the reproduction chain to experience the "live event".
For optimum signal amplification the SP-8 utilize vacuum tube audio circuitry. While the transistor has replaced the vacuum tube in most popular consumer electronics, the vacuum tube still offers a number of design adventages over solid-state devices.  The vacuum tube has ceratin unique electrical properties that make it highly attractive for use in quality audio electronics.
Audio Research continues to incorporate the vacuum tube in its designs many years after tube technology was considered impractical. However, experience dictates that for state-of-the-art. Music reproduction the vacuum tube is difficult to surpass. Because of its long-term involvement in vacuum tube design Audio Research  is regarded as the leader in vacuum tube technology.

Automatic muting for continuous protection
Manual muting for repeat settings,interruptions, etc.
Front panel power switch for activating 1600 watt capacity back-chassis, plug-in power receptacles.
High accuracy, close tracking segmented gain control
Sonically selected components for optimum sound performance
Near military grade construction used throughout.
Frequency Response:
High Level :  + .25 dB; 5 Hz - 30 kHz
Magnetic Phono :  + ,25 dB of RIAA, 30 Hz - 40 kHz
Harmonic Distortion:  less than ,01% at 2V RMS output, 20 Hz -20 kHz
Input Impedance:  50 k Ω, all inputs
High Level :  250 µV RMS maximum residual unweighted wideband noise
Magnetic Phono :  5 µV maximum equivalent input noise, wideband RMS
Dimensions (W x Hx D):  19" x 5,25" x 10,25"

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