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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





Kenwood KR-4070

 Kenwood KR-4070 Stereo Receiver
This is a unique solution to the Power-vs.-Price dilemma. A no-nonsense, high performance receiver at an unbelievably low price.
 KR-4070 Included Features
40 watts per channel, Min. RMS both channels driven at 8 ohms.
Full complementary symmetry differential main amplifier circuit for high stability.
3-gang tuning capacitor and FET front end for high sensitivity with low distortion
4-element linear phase IF filter for high selectivity
PLl in FM Multiplex for improved stereo separation
FM Auto Muting
Connections for 2-pairs of speakers
Natural low-boost only loudness control
Tape monitor
Optonial CB-7K walnut veneer cabinet, B-7 walnut veneer side panels, or D-7 carrying handles available.
Specifications
Min. RMS Power Output:  40 watts per channel (at 8 Ω, 20-20,000 Hz)
Total Harmonic Distortion:  no more than 0,05%
IM Distortion (at reted power):  0,05%
Damping Factor (at 8 Ω):  40
Imput Sensitivity:
Phono : 5,0 mV/ 190 mV
Aux, Tape : 150 mV
Signal-to-Noise Ratio:
Phono : 79 dB
Aux, Tape : 95 dB
FM Tuner Section
Sensitivity at 30 dB Quieting:  1,9µV  (10,8 dBf)
Sensitivity at 50 dB Quieting
Mono : 3,1µV (15,0 dBf)
Stereo : 40µV (37,2 dBf)
Max. Quieting
Mono : 72 dB
Stereo : 67 dB
Total Harmonic Distortion
Mono : 0,15%
Stereo : 0,25%
Capture Ratio:  1,0 dB
Alternate Channel Selectivity:  60 dB
Stereo Separation:  43 dB at 1 kHz; (35 dB at 50 - 10 kHz)
General
Inputs and Outputs:  Phono, Aux, Tape and 2 Speakers, Phones
Dimensions (W x H x D):  18-1/2 x 5-7/8 x 15-1/2 inch

Weight:  20,7 lbs