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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





Sansui Model 250

 AM/FM Multiplex Stereo Tuner Amplifier Tube-Type
Even at a modest 22 watts, Sansui engineering has made the Model 250 a completely self-contained unit with Multiplex tuner and amplifier all in one.  Like Sansui's larger tube model, the 1000A , Model 250 incorporates the latest push-pull connection of super wide-band transformers with high-performing multi-unit tubes 6BM8, an advanced silicon transistor head amplifier, plus a newly designed NF circuit for a power bandwidth from 35 to 15,000 Hz, a 22 watt power output and a distortion factor of only 1,5%. The 250 has also been provided with the latest multiplex circuit for a stereo separation figure of 35 dB.
A tape recording terminal, tape monitoring circuit, center channel output terminal, headphone jack, loudness compensation control, noise filter and automatic tuning eye put the 250 far out in front of similar sized and priced receivers.
Specifications
Amplifier Section
Music Power (IHF):  22 watts ±1 dB
Continuous Power:  10 / 10 watts ±1 dB
Harmonic Distortion:  less than 1,5% at rated output
Power Bandwidth (IHF):  35 - 15,000 Hz
Input Sensitivity: 
Phono :  3 mV
Aux :  150 mV
Tape Monitor :  660 mV
Hum and Noise (IHF):
Phono :  65 dB
Aux :  70 dB
Output Impedance:  8 Ω and 16 Ω
FM Tuner Section
Frequency Range:  88 - 108 MHz
Sensitivity:  2,5 µV  ±3 dB (S/N 20 dB quieting)
Sensitivity:  4,0 µV  ±3 dB (IHF)
AM Tuner Section
Frequency Range:  535 - 1605 kHz
Sensitivity (IHF):  30 µV  ±3db
Seminonductors:  2 Transistors ; 10  Diodes
Tubes :  16
Power Voltage:  100, 117, 220 and 240 V;  50/60 Hz
Power Consumption:  115 VA max
Dimensions (W x H x D):  17-3/8 x 5-5/32 x 12-19/32 inch
Weight:  28,2 lbs

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