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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





Sanyo Plus T55 tuner

Digital Tuner with Memory
Described as "the first radical departure in tuner design in four decades". Sanyo's Plus T55 tuner combines an electronically tuned front end and digitally programmable quartz crystal reference oscillator to provide "superb" audio performance. And thre's another unique benefit; it's impossible to mistune a station. As long as the station's frequency appears in the bright fluorescent digital display and the center tune indicator is lit, the receiver is perfectly tuned at the exact point of minimum noise and distortion. Plus T55 has a passive four-pole LC filter that is double-tuned to reject not only the 19 kHz multiplex pilot tune, but also the 38 kHz multiplex subcarrier. Thus the high frequency subcarrier cannot interact with the bias frequency of tape decks. The band/mode selector lets you choose AM or either of two FM modes; auto, with automatic switching to stereo  mode in the presence of a multiplex signal; and mono, which suppresses stereo information in all signals, allowing noisy stereo signals to be heard with improved quality.
 Specifications
FM Section
Frequency Range:  88- 108 MHz (100 kHz steps)
Usable Sensitivity (Mono):  1,8 µV (10,3 dBf)
Signal-to-Noise Ratio
Mono :  75 dB
Stereo :  70 dB
Total Harmonic Distortion (1 kHz)
Mono :  0,15% (Narrow);  0,09% (Wide)
Stereo :  0,2% (Narrow);  0,1% (Wide)
Frequency Response:  20 Hz - 15,000 Hz   +1 dB -2 dB
Alternate Channel Selectivity (at ±400 kHz)
80 dB (Narrow)
55 dB (Wide)
Capture Ratio
1,8 dB (Narrow)
1,2 dB (Wide)
Stereo Separation at 1khz
42 dB (Narrow)
48 dB (Wide)
AM Suppression:  60 dB
Image Rejection (at 98 MHz):  70 dB
Antenna Input:  300 Ω (balanced);  75 Ω (unbalanced)
AM Section
Frequency Range:  530 - 1,600 kHz (10 kHz steps)
Usable Sensitivity (at Ferrite Antenna):  300 µV/m
Signal-to-Noise Ratio (at 5 mV/m):  45 dB
Selectivity:  35 dB
Image Rejection (at 1,000 Hz):  50 dB
IF Rejection (at 1,000 kHz):  45 dB
Antenna:  ferrite bar antenna; External Antenna
General
Power Requirements:  AC 120 V 60 Hz;  200 V 50/60 Hz
Power Consumption:  9 W
Dimension (W x H x D):  440 x 270 x 44 mm (17-3/8 x 10-1/16 x 1-3/4 inch)
Weight:  5 kg (11 lbs)
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