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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





Hitachi SR-4010 receiver

Hitachi SR-4019 AM/FM stereo receiver FTC rated for 8 ohms at 25 watts RMS per channel, 20 Hz to 20 kHz , at no more than 0,05% Total Harmonic Distortion
Features include:
Left and right 5 step LED output power indicators, calinrated at 0,01; 0,1; 1; 10 and 30 watts into 8 ohms, that also serve as an FM tuning indicator (left meter) and AM/FM signal strength meter (right meter); an FM stereo beacon; an FM mute that is applied automatically when the receiver is in the stereo mode (the mute is off when the receiver is set for full time mono); and a subsonic filtter that is applied automatically when the LED indicators are switched to the tuning indicator mode (the subsonic filter is off when the meters are switched to indicate output power)
There are inputs for magnetic phono, and tape Outputs for two speaker systems, tape and [phones. Controls are provided for tuning volume, balance, ganged bass, ganged treble, speaker selection, and input selection/FM muting. There are switched for loudness compensation, tape monitor, and meter mode/subsonic filter.
The FM antenna input is 75/300 ohms. An internal antenna and external connection are provided for AM. There is one unswitched AC outlet.
Tuner performance
FM Tuner. Full limiting was attained with 2,8 µV. The monophonic high fidelity sensitivity (60 dB quieting) measured 8 µV. The stereo high fidelity sensitivity (55 dB quieting) was 90 µV. Full mute release was attained with 6 µV. At standard test level the stereo frequency response measured +0,2/-1,5 dB from 40 to 15,000 Hz, down 2,2 dB at 30 Hz . Monophonic distortion measured 0,2% Total Harmonic Distortion, stereo distortion was 0,5% Total Harmonic Distortion. The signal to noise ratio measured 67 dB. Stereo separation was 36 dB. Selectivity was very good. The 19 kHz FM pilot leakthrough is some what higher than average. Make certain the MPX filter on a Dolby recorder is switched in when recording from FM. On most recorders the MPX filter is automatically applied with the Dolby.
AM tuner. Background noise was higher than average.
Amplifier peformance. The power output per channel at the clipping level with both chaannels driven 20 to 20,000 Hz into 8 ohms measured 27 watts RMS. The frequency response at 27 watts/8 ohms measured +0 dB -3 dB from 20 to 20,000 Hz at a distortion no higher than 0,06% Total Harmonic Distortion at any frequency. The subsonic filter produced 2,5 dB attenuation at 20 Hz. The tone control range measured =11/-12 dB at 50 Hz ; ±8 dB at 10,000 Hz. The magnetic input hum and noise was -69 dB; stero separation was into the noise level.
Meters
The LED output power indicators, because of the broad range between values, indicate approximate power. They serve as a reference rather than as precise value. Their frequency response is essentially "flat". When used as tuning meters the right indicator functions as light-bar )or bar-graph) signal strength meter, while the center LED in the left indicator serves to indicate proper tuning-it snaps on when an FM station is tuned properly; essentially, the LED substitutes for a center-channel tuning meter.


Dimensions (W x H x D):  17-1/8" x 4-3/8" x 11-1/8"
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