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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 C809


Specifications:
The Dual C809 fulfills or exceeds the requirement of DIN 45 500 for domestic HiFi equipment. 
Tape Speed:  4,75 cm/s
Deviation from Correct Speed:  less than ±1%
Wow and Flutter:  weighted RMS :  less than ±0,07%
To DIN for reproduction only :  less than ±0,12%
To DIN for recording/reproduction :  less than ±0,16%
Frequency Response (ref-to DIN tolerances)
Fe Standard Tape :  20 -15,000 Hz
CrO₂ Tape :  20 - 15,000 Hz
FeCr Tape :  20 - 16,000 Hz
Distortion K3 at 333 Hz (ref.to 0 dB VU)
Fe Standard Tape :  less than 0,7 %
CrO₂ Tape :  less than 1,5 %
FeCr Tape :  less than 0,7 %
Signal-to-Noise Ratio (weighted)
With Dolby NR
Fe  Tape : better than 63 dB
CrO₂ Tape : better than 63 dB
FeCr Tape : better than 65 dB
Without Dolby NR
Fe Tape :  better than 56 dB
CrO₂ Tape : better than 56 dB
FeCr Tape :  better than 58 dB
Channell Separation at 1000 Hz
Between Stereo Channels :  better than 30 dB
In Oppositie Direction :  better than 70 dB
Erasure at 1000 Hz :  better than 70 dB
Oscillator (push-pull oscillator):  80 kHz
Inputs ( Sensitivity at 0 dB VU)
Microphone :  0,2 mV/10 k Ω
Receiver/Amplifier
DIN Connector :  0,6 mV/10 k Ω
RCA Jack :  65 mV/ 45 k Ω
Outputs
Receiver/Amplifier
DIN Connector :  560 mV/8 k Ω
RCA Jack :  580 mV/1,0 k Ω
Headphones :  4 - 2000  Ω adjustable
Tape Motion Monitoring:  Electronic
Complement:  2 Ics; 30 Transistors; 13 Diodes; 2 LED's; Z-diode; 1 Silicon bridge rectifies; 2 G-Fuses 400 mA slow-blow
Power Requirements:  100 -125 V / 220 - 240 V, 50/60 Hz
Power Consumption:  approx. 10 Watt

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