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

Optonica ST-105H

Optonica ST-105H
Microcomputer-Controlled Quartz PLL Synthesizer FM/MW/LW Stereo Tuner
Optimum reception with maximum convenience are combined innthis blend of precision electronic systems and state-of-the-art. Component parts. Designed to eliminate error and drift, this advanced electronic tuner employs a quartz PLL synthesizer tuning system to ensure super-precise, super-stable reception under all conditions. This precision is backed by an electronic input attenuator, a dual-gate MOS FET front end, ceraamic IF filters and a quadrature detector. A microcomputer controls both the audio search and station memory tuning systems to provide automatic location of receivable stations and one-touch tuning of favourite stations. A remote control station selection system, digital frequency display and air check calibrator function facilitate optimum use of this advanced tuner.

FM Section
Frequency Range:  87,5 - 108 MHz
Antenna Input:  75 Ω unbalanced; 300 Ω balanced
Synthesizer Tuner:  yes
Span Frequency:  0,05 MHz
Automatic Tuning:  yes
Pre-Setting Station;  FM/AM total 10
Sensitivity :
Mono (DIN 40 kHz dev. Signal-to-Noise 26 dB):  1,3 µV (75 Ω); 1,6 µV (300 Ω)
Stereo (DIN 40 kHz dev. Signal-to-Noise 46 dB):  39 µV (75 Ω); 45 µV (300 Ω)
Total Harmonic Distortion (1 kHz, 40 kHz dev.):
Mono :  0,2%
Stereo :  0,3%
Signal-to-Noise Ratio (1mV, 40 kHz dev. 1 kHz):
Mono :  66 dB
Stereo : 61 dB
Frequency Response:  30 Hz - 15 kHz (±3 dB)
Image Rejection (at 98 MHz):  75 dB
IF Rejection(at 98 MHz):  75 dB
AM Suppression (modulated 30%, AM by 1 kHz and 100% FM by 400 Hz):  50 dB
Selectivity (±300 kHz, 40 kHz dev.):  45 dB (normal)
Capture Ratio:  2,5 dB (normal)
Subcarrier Suppression:  45 dB
Stereo Separation:
At 1 kHz :  40 dB
At 10 kHz :  30 dB
AM Section
Frequency Range: 
MW :  522 - 1610 kHz
LW :  150 - 372 kHz
Antenna:  Built-in ferrite bar antenna; External Antenna terminal
Synthesizer Tuner:  yes
Span Frequency:  auto 9 kHz, manual 1 kHz
Automatic Tuning:  yes
Pre-Setting Station:  FM/AM total 10
MW :  350 µV/m (Signal-to-Noise 20 dB, 999 kHz)
LW :  350 µV/m (Signal-to-Noise 10 dB, 218 kHz)
Audio Section
FM Output (40 kHz dev.):  350 mV (fixed)
AM Output (30% mod.):  200 mV (fixed)
Power Sourece:  110/220/240 V 50/60 Hz AC
Power Consumption:  15 W (220 V)
Dimensions (W x H x D):  430 x 71 x 298 mm
Weight:  3,4 kg

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