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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 FT-3500 (1981)

 Hitachi FT-3500 AM/FM Stereo Tuner (1981)
Specifications
Circuitry:  AM/FM 2-band Stereo Tuner
Semiconductors:  3 ICs; 12 transistors (1 FET); 10 diodes (2LEDs)
FM Section
Frequency Range:  88 - 108 MHz
Usable Sensitivity:  10,8 dBf (IHF), 1,0 µV (75 Ω DIN)
Image Interference Ratio:  50 dB (98 MHz; IHF and DIN)
IF Interference Ratio:  80 dB (98 MHz, IHF and DIN)
Total Harmonic Distortion:
Mono :  0,1% (1 kHz)
Stereo :  0,25% (1khz)
Signal-to-Noise Ratio:
Mono :  77 dB (IHF) 70 dB (DIN)
Stereo :  70 dB (IHF) 64 dB (DIN)
Frequency Response:  30 Hz - 12 kHz (75 µs ±2,0 dB)
Selectivity:  50 dB  (±400 kHz, IHF), (±300 kHz, DIN)
Stereo Separation:  45 dB (1 kHz IHF and DIN)
Capture Ratio:  1,0 dB (IHF and DIN B.P.F. 1 kHz)
AM Suppression Ratio:  50 dB (IHF and DIN)
Output Voltage:  550 mV (400 Hz, 75 Hz deviation)
Antenna Terminal:  300 Ω balanced and 75 Ω unbalanced
AM Section
Frequancy Range:  530 - 1605 kHz
Sensitivity:  15 µV (IHF), 40 µV (DIN); 400 µV/m (IHF loop antenna)
Image Interference Ratio:  50 dB (IHF and DIN)
IF Interference Ratio:  40 dB (IHF and DIN)
Selectivity:  34 dB (±10 kHz, IHF); 30 dB (±9 kHz, DIN)
Signal-to-Noise Ratio:  53 dB (IHF and DIN)
Output Voltage:  165 mV 9400 Hz, 30% modulation)
General
Power requirements:  AC 110-120 V, 220-240 V 50/60 Hz
Power Consumption:  6 watts
Dimensions (W x H x D):  435 x 83 x 253 mm (17-1/8" x 3-1/4' x 9-61/64")

Weight:  3,4 kg (7,5 lbs)
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