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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





Dual C 830 cassete deck

Three Head Cassette Deck
Dual  C 830 front loading stereo cassette deck offers three heads for true tape monitoring during recording, full record/playback metal capability, and electronic fade/edit for rediting during playback. A phase-locked loop DC servo motor with integral frequency generator provides highly accurate and stable tape drive, according to the manufacturer. Logic-controlled tape-transport functions and an electronic tape-motion sensor prevent jams and tape spills. A unique Dual Direct Load and lock System (DLLS) eliminates hinged cassette door and provides automatic head protection during insertion and removal of a cassette. A six-way bias/equalization switch includes a setting for new metal tapes. Equalized LEDs provide peak-level indications.
Other features; twin-belt drive system; two-way line/MIC mixing; switchable limiter circuit; headphone level controls; MPX filter switch; Dolby noise reduction; left/right microphone inputs; Sendust record and playback heads.
Specifications
Motor:  PLL DC servomotor type
Heads / Composition:  3 / Sendust, high flux
Speed Accuracy:  less than 0,4%
Wow and Flutter (WRMS):  ±0,035%
Frequency Response (±3 dB, w/MPX filter switched out):
With Ferric Oxide :  20 zh - 17 kHz
With Chromium Dioxide :  20 Hz - 18 kHz
With Ferrichrome :  20 Hz - 19 kHz
With Metal ;  20 Hz - 20 kHz
Signal-to-Noise Ratio (Dolby in):
Ferric Oxide tape :  better than 67 dB
Chromium Dioxide  tape :  better than 67 dB
Ferrichrome tape :  better than 69 dB
Metal tape :  better than 69 dB
Harmonic Distortion:  less than 0,4%
Erasure at 1 kHz :  better than 70 dB
Cross Talk
In Opposite Direction:  better than 70 dB
Between Stereo Channels ;  better than 40 dB
Fast Wind Time (C-60):  65 sec
Dimensions:  17-3/16" x 5-3/4" x 13-3/8"
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