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





Sherwood S-7800

 Model S-7800 140 Watt AM-FM Stereo Receiver with Microcircuits and Field Effect Transistors
Featuring:
Monolithic Microcircuits
140 watts Music Power
FET RF and Mixer Stages
Symmetrical differential FM limiter
Low-distortion FM detector
DC Coupled All Silicon Power Amplifiers
Mono (center-channel) Output Terminals
3-years Warranty on all parts
Specifications
FM Sensitivity (IHF):  1,8 µV for -30 dB (noise and distortion below 100% mod.)
Typical Sensitivity FM:  0,95 µV for 20 dB quieting. 5.0 µV for 50 dB S/N
Typical Selectivity
FM :  250 kHz at -6 dB; 820 kHz at -60 dB
AM :  4 kHz at -6 dB
FM Ratio Detector:  800 kHz (peak/peak)
Capture Ratio:  2,0 dB
FM Tuning Range:  87,5 - 108,5 MHz
AM Tuning Range:  530 - 1650 kHz
Distortion:  less than 0,15%
Hum and Noise Level
FM:  70 dB below 100% mod.
AM:  56 dB below 100% mod.
FM Crossmodulation Rejection:  -95 dB
AM Rejection (on FM):  -55 dB
FM Stability:  ±10 kHz  (±.01%)
Record Output:  1 volts at 100% FM
FM Oscillator Radiation:  3 dB below FCC stds.
Antennas
FM:  300 Ω balanced
AM:  Directable ferrite rod w/external antenna connection
Frequency Response:
FM Mono :  20 - 20,000 Hz  (± ½ dB)
FM Stereo :  20 -15,000 Hz (± ½ dB)
AM :  -6 dB at 4,0 kHz
Amplifier :  20 - 20,000 Hz (± ½ dB)
Inputs:  2 High Level; 2 (RIAA) Phono-preamp; 2 tape monitor
Power Output:
Music Power :  140 watts at 4 Ω;  100 watts at 8 Ω
Continuous Power (each channel) :  60 watts at 4 Ω;  40 watts at 8 Ω at 0,6% distortion
Outputs:  4 to 16 Ω left and right speaker main and remote, stereo headphone and record output
Inverse Feedback:  50 dB
Damping Factor:  40 : 1 at 8 Ω
Tone Control Response:  Flat Setting 20 Hz to 20 kHz ±1 dB
Tone Control Range:  15 kHz, 15 dB, boost or cut, 40 Hz, 16 dB boost or cut
High Filter:  20 kHz, 23 dB rejection; 5 kHz less than 3 dB down
Preamp Equalizer Curves:  AES/RIAA phono and NAB tape
Sensitivity:
Phono :  1,6 mV
Tape Head :  1,2 mV
Aux :  0,2 V (PH and TP inputs are adjustable with preamp level Control)
Max. Input Capability: 
Preamp :  250 mV for less than 1% distortion
Aux :  2,5 V for less than 1% distortion
Max. Hum and Noise:
Volume control min. 90 dB (weighted) below rated output
Auxiliary input (controls maximum) 80 dB (weighted) below rated output
Phono input (controls flat) 60 dB below rated output
Interchannel Crosstalk:  less than -40 dB at 1 kHz
Power  Supply:  115 - 125 V, 60 Hz, 30 to 160 watts fused
Dimensions  (W x H x D):  16 ½" x 4 ½" x 14"

Weight (shipping):  35 lbs

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