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

Sony TAN-8550

 Stereo Power Amplifier. Prestige main amplifier with revolutionary V-FETs.

Power output of 100 W + 100 W RMS from 20 Hz to 20 kHz, both channels driven, at 8 ohms and under 0,1% THD.
Newly developed P-channel and N-channel V-FETs in a true complementary triple push-pull circuit which is coupled directly to the speaker terminals for faithful signals.
Dual FETs in triple differential circuit of Class-A amplification stage - for stable performance regardless of temperature fluctuation as well as for high input impedance.
Optical peak program meter - extremely quick response to show accurately the amount of power being fed to the speakers. Two-position sensitivity switch of X 1 (from 0 to 200 W) and X ¹/₁₀ (from 0 to 20 W).
Chimney type heat-sink provides effective cooling for stable performance.

Speaker Level Control
An independent level control is provided with B-speaker circuit (convenient to test or balance two different systems or to compensate for a difference in speaker efficiency)
Subsonic Filter
Prevents sound from adversely affecting by inaudible low frequency components, such as those generated by rumble or acoustic fedback in a turntable system (Normal/test switch on the rear panel).
 Sony power V-FET (Vertical Field Effect Transistor)
V-FET has ideal characteristics for an audio amplifier:
Quick transient response to pulsive signals, which assures minimum distortion and excellent phase response.
High input impedance and low output impedance, which allows excellent circuit design with greater flexibility and ease.
Smooth pinch-off characteristics which assures miniumu distortion.
Voltage controlled input characteristics which cause virtually no partial current concentration, assuring temperature stability.
Continuous Power Output RMS (both channels driven at 8 Ω, 0,1% THD):
100 W + 100 W :  20 Hz to 20 kHz
110 W + 110 W :  1 kHz
Power Bandwidth  (IHF):  5 Hz - 50 kHz
Harmonic Distortion:
At rated output :  0,1%
At 1 W output :  0,05%
I.M. Distortion (60 Hz : 7 kHz = 4:1):
At rated output :  0,1%
At 1 W output :  0,05%
Frequency Response: 
20 Hz - 100 kHz  +0 -3 dB (Normal)
DC - 100 kHz  +0 -1 dB (Test)
Residual Noise:  0,01 µW
Signal-to-Noise Ratio:  100 dB (closed circuit)
Inputs Sensitivity/Impedance:  1 V (for rated output)/ 50 k Ω
Output:  Speaker A,B and Direct
Power requirements:  AC 100, 120, 220 or 240 V  50/60 Hz
AC Outlet:  Unswitched 200 W
Dimensions (W x H x D):  440 x 170 x 410 mm (17-3/8" x 6-3/4" x 16-1/8")

Weight:  19 kg (41 lb 14 oz)

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