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

Toshiba SA-7150

The Toshiba 7150 locks into the center of any station's assigned broadcast frequency and eliminates drift.

A few yearas ago, Toshiba introduced and marketed the first fully electronic digital-synthesized tuner. Now Toshiba has another first. We've built a digital-synthesized tuner into a high-powered, low-distortion FM/AM receiver; the Toshiba 7150 with Synthetune™
Synthetune is a function that provides tuning so accurate even a center tuning meter is unnecessary.
Drift is eliminated.
The 7150's FM tuner section also contains flat group delay IF circuitry. And a quartz crystal oscillator, which automatically locks into the center of any station's assigned broadcast frequency - as precisely as the station's own transmitter.

Tune the 7150 just by pushing the auto-scan button. It scans the full range of the  AM or FM band, stopping precisely at each listenable station. Bright green LED numerals instantly display all frequencies as they are tuned. Of course, there's more to the 7150 than Synthetune. It also has separate transformers for class A and class B amplifier sections. The toroidal transformer for class B amplification has separate left and right power supplies.
It also has Dolby FM and an air check switch for accurate tape recording. Furthermore the 7150 delivers a minimum of 150 watts per channel into 8 ohms, 20 Hz to 20,000 Hz , with no more than 0,05% Total Harmonic Distortion. And the restof the specs are just as impressive.

Continuous Power Output:  150 W/channel (min. RMS at 8 Ω, 20-20,000 Hz , no more than 0,05% T.H.D.)
PoweR Output:
At 4 Ω :  2 x 230 W (20 - 20,000 Hz both channel driven
At 8 Ω :  2 x 160 W (1 kHz both channel driven)
At 4 Ω :  2 x 250 W ( 1 kHz both channel driven)
Total Harmonic Distortion ( at 8 Ω)
At Rated Power Output :  0,05%
At 1 W :  0,03%
Intermodulation Distortion:  0,05%
Damping Factor:  50
Input Sensitivity/Impedance:
Phono 1 :  2,5 nV/47 k Ω
Phono 2 :  2,5 mV/ 47 k Ω (100p/250p/450pF)
Tuner, Tape, Aux:  150 mV/47 k Ω
Phono Overload level:  350 mV RMS at 1 kHz
Output level
Tape REC :  150 mV
DIN :  30 mV
Pre Out :  1000 mV
Frequency Response:
Phono (RIAA Equalization) :  30 Hz to 15 kHz; ±0,2 dB
Aux, Tape :  10 Hz to 50 kHz; +0,5 -1 dB
Tone Control
Bass :  ±10 dB at 100 Hz
Treble :  ±10 dB at 10 kHz
Turnover Frequency:  200/400 Hz; 2,5 K/5 kHz
Loudness Contour:  +8 dB at 100 Hz +4 dB at 10 kHz
Signal-to-Noise Ratio(IHF short-circuited A network rated power)
Phono :  80 dB
Aux, Tape :  95 dB
Low :  20 Hz -6db/oct
High : 7 kHz -6 dB/oct
FM Tuner Section
Usable Sensitivity:  Mono 9,8 dBf 91,7 µV)
50 dB Quieting Sensitivity: 
Mono 14,7 dBf (3,0 µV)
Stereo 37,6 dBf (42 µV)
Signal-to-Noise Ratio:
Mono :  75 dB
Stereo :  70 dB
Distortion [Wide/Narrow]
At 100 Hz :  Mono 0,08/0,1%; Stereo 0,1/0,2%
At 1 kHz :  Mono 0,08/0,1%; Stereo 0,1/0,2%
At 6 kHz :  Mono 0,1/0,2%: Stereo 0,15/0,25%
Frequency Response:  20 Hz to 15 kHz ±0,5 dB
Alternate Channel Selectivity:
Wide :  50 dB
Narrow :  80 dB
Capture Ratio:  1,0 dB
Spurious Response Ratio:  100 dB
Image Rejection Ratio:  85 dB
IF Rejection Ratio:  100 dB
AM Suppression Ratio:  55 dB
Stereo Separation:  50 dB (1 kHz); 35 dB (30 Hz -15 kHz)
AM Tuner Section
Sensitivity:  350 µV/m (IHF, ferrite antenna)
Selectivity:  30 dB
Signal-to-Noise Ratio:  50 dB
Image Rejection Ratio:  40 dB
Power Requirements:  AC 120 V, 60 Hz - 220- 240 V 50/60 Hz
Power Consumption:  650 watts (UL) 6,8 A (CSA)
Dimensions (W x H x D):  550 x 200 x 500 mm
Weight:  27 kg

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