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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





H. H. Scott 330D (1961)


The 330D was the ultimate development of Scott's stereo AM/FM tuner line, designed to receive stereo AM/FM simulcasts. The switching provisions were much improved over those of the 330C, to provide more flexibility for the reception of AM/FM simulcasts. The slide switch was changed back to the configuration it had on the 330B, to allow switching the tuning meter between the AM and FM tuner sections, without disturbing reception. The power switch was converted to serve as the mono/stereo switch, in addition to switching power. In addition to positions for power off, monophonic operation, and stereophonic operation, it had a fourth position for stereo phase reverse. The phase revere position was useful in receiving stereo AM/FM simulcasts, to correct for reversed phase at one of the transmitters. In the 330D, a 6CN7 was used as the AM detector, replacing the 6AL5 in the 330C. The 6CN7 provided the extra triode section needed to implement the stereo phase reverse function.

H.H. Scott 330D Features:
Silver Plated Front End
FM Cascode RF End
Multiplex Output Jack
Meter Tuning Indicator
Stereo Phase Reverse Position
Planetary Tuning Mechanism
Wide Range AM Detector
AM Loopstick Antenna
Tape Recorder Outputs
Output Level Controls
Separate AM & FM Sections

Automatic Gain Control


330D Technical Specifications
Sensitivity for 20 dB Quieting :  2 μV
IH FM Sensitivity:  2,5 μV
FM Detector Bandwidth:  2 mc
FM IF Stages:  2
FM Limiting Stages:  2
Harmonic Distortion on FM:  0,8%
Capture Ratio: 6 dB
Am Bandwidth Position:  3
Output Voltage for 100% Modulation:  4 - 6
Total Hum and Noise:  66 dB (below 1  x volt)

Dimensions:  15½ x 5¼ x 13¼ inch (accessory case)



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