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





Teac AT-100

 TEAC AT-100
New Multiplex Channel Separation Circuitry
New low level multiplex sensitivity provides clean clear stereo operation with only a 10 µV input. The all new multiplex amplifier provides complete channel separation (40 dB at 1 kHz, 100% modulation) even where stations are closely located in frequency and physical proximity to each other.

Sharply Selective-Stable IF circuitry
The FM IF stages of the AT-100 incorporate 6 element ceramic filters for precise exact bandpass shaping. Sharply selective, unaffected by humidity or aging, they provide many years of trouble free operation.

Noise Free FM Receprion
A total of 10 limiting stages are employed in the AT-100 (4 diode limiter stages,  6 transistor limiter stages) to provide  complete freedom from pulse noise reception from auto ignition systems, electrical appliances and atmospheric disturbances.

Advanced Solid State Front End
A dual gate MOS type field effect transistor and a junction type FET are used in the FM RF section to provide maximum gain and sensitivity, high selectivity and the maximum in interference rejection.

Precision Tuning System
The AT-100 tuner employs a 4 gang, linear graduation tuning condenser coupled to a weighted tuning system. The dial features a linear tuning display across the entire tuning band. Independent signal strength and channel center tuning meters make precision tuning remarkably simple.

Interstation Noise Muting
An extremely sensitive muting circuit completely eliminates interstation (white) noise when tuning between stations. Switch controlled from the front panel, the muting circuit can be disabled for tuning extremely weak (fringe area) stations.

Dual Output Facility
The AT-100 is provided with both fixed and variable output level jakc thus is compatible with any currently available amplifying system.

Remarkable Performance Specifications - Moderate Cost.
The overall sensitivity and selectivity of this superb tuner provide clear distortion free FM stereo reception even if fringe areas at a surprisingly moderate cost.

Regulated Stable Power Supply
A completely solid state, closely regulated power supply contributes to the stability of operation of the At-100. prevents station drift even in areas where line voltage is not constant.
Specifications
MODEL AT-100
Type:  All transitor FM stereo tuner
Semiconductors:  25 Transistors, 29 Diodes
Circuits:  Superheterodyne
FM Section
Receiving Frequency:  88 - 108 MHz
Intermediate Frequency:  10,7 MHz
Sensitivity:  2,0 µV (IHF)
Capture Ratio:  below 1,5 dB
Image Rejection:  better than 90 dB (98 MHz)
IF Rejection:  better than 90 dB (98 MHz)
Selectivity:  better than 65 dB (±400 kHz)
Signal-to-Noise Ratio:  better than 70 dB (1 mV input, 100% modulation)
Harmonic Distortion:  below 0,5% (1 kHz, 100% modulation)
FM Stereo Separation: 
Better than 40 dB ( 1 kHz, 100% modulation)
Better than 30 dB (100 - 10,000 Hz , 100% modulation)
Frequency Response:  50 - 15,000 Hz ±1 dB
AM Suppression:  better than 50 dB (FM 400 Hz, 100%; AM 1 kHz, 30%)
19 and 38 k Hz Suppressions:  better than 55 dB
Frequency Drift:  25 kHz
Input Indicator:  by tuner input meter
Tuning Indicator:  by tuning meter
Stereo Indicator:  by stero indicator lamp
Automatic Stereo Switch Level:  10 µV
Muting Switch level:  10 µV
Rated Outputs:
Fixed :  1 V (400 Hz , 100% modulation)
Variable :  1 V (400 Hz, 100% modulation)
Output Impedance:  30,000 Ω
Power requirements:  100/117/220/240 V AC 50/60 Hz
Power Consumption:  16 W
AC Outlet:  300 W Unswitched
Dimensions (W x H x D):  410 x 141 x 328 mm (16-1/8" x 5-9/16" x 12-15/16")
Weight:  7,5 kg (16,5 lbs) net

Optional Eurasian teak Decorator Panels  - AGC-30
Both the AS-100 and the AT-100 may be fitted with Eurasian hand rubbed teakwood decorator panels. Available as an optional accessory.

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