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 SM-110H

 Optonica SM-110H
Integrated Stereo Amplifier with Zero Switching System
This high-efficiency zero-switching amp employsOptonica's advanced semiconductor technology and innovative spikeless amplifier design to eliminate switching distortion and ensure low thermal loss. With a zero-switching system controlling each output transistor, just enough current is provided to prevent cutoffs and the resulting distortion. The OCL/ICL (outputcapacitorless/input capacitorless) preamplifier stage with differential FET and DC servo control ensure the most accurate possible signal at all frequencies. The more than ample power rating of this unit is supplied without distortion, while innovative DC servo circuitry provides all the advantages of a DC amplifier and eliminates the adverse effects of output capacitors. The DC servo equalizer makes it unneccessary to employ a step-up transformer or head amplifier when using a moving-coil cartridge. A remote action switch has allowed the input and output connections to be placed as close as possible to pre-amplifier and power output stages to reduce noise generation at the input and speaker output connections. Rec Out selection is simplified and totally unafected by the position of the input selector. A full range of controls essential to tailoring the response of a stereo system are provided. The system is safeguarded by an automatic protection circuit.
 Zero-switching output circuitry and a spikless amplifier design combine to eliminate distortion caused by power stage cutoff while maintaining output efficiency.
 Straight DC servo circuitry eliminates all coupling elements, including output capacitors, to eliminate distortion.
 The DC servo equalizer makes it unneccessary to employ a step-up transformer or head amplifier when using a moving-coil cartridge.
 The MC/MM phono selector switch allow you to take advantage of either type of cartridge.
 Remote action switch suppresses noise generated at input and output connections.
 Separate Rec Out and input selectors allow extra recording and listening versatility.
 The full range of controls includes loudness, subsonic filter and mode switchess plus 11 click-stop bass and treble controls.
 The 4-position speaker selector provides a variety of listening arrangements with two speaker systems.
 The automatic protection circuit shuts off the output stage of the amplifier to prevent damage to the amp and speakers, and indicates circuit status with a 2-colour LED.
Power Amp Section
Circuitry: pure complementary OCL, ICL, High Gain DC amplifier
Continuous Power Output
At 1 kHz  (both channel driven, 0,01% distortion):
2 x 100 W at 4 Ω
2 x 70 W at 8 Ω
From 20 to 20,000 Hz (both channels driven 0,05% distortion):
2 x 85 W at 4 Ω
2 x 65 W at 8 Ω
Intermodulation Distortion:  0,01% at rated power
Power Bandwidth:  10 Hz - 50 kHz at 0,05% distortion, 8 Ω
Pre Amp Section
Equalizer:  OCL type DC amp., equalizer with first stage FET, differential ICL and DC servo circuit
Tone Control:  NF type,differential amplifier dual power supply
Input Sensitivity/Impedance:
Phono MM :  2,3 mV/47 k Ω
Phono MC :  0,23 mV/100 Ω
Aux :  150 mV/47 k Ω
Tuner :  150 mV/47 k Ω
Tape PB 1 and 2 :  150 mV/47 k Ω
Output Level/Impedance:
Rec 1 and 2 :  150 mV/47 k Ω
Rec (DIN socket) :  30 mV/82 k Ω
RIAA Curve Deviation:  ±0,3 dB (20 -20,000 Hz)
Allowable Maximum Input for Equalizer:
Phono MM :  130 mV (RMS, 1 kHz)
Phono MC :  13 mV(RMS, 1 kHz)
Frequency Response:  DC to 80 kHz +0 -2 dB
Signal-to-Noise Ratio (IHF A-Network, Input short circuited):
Phono MM :  83 dB
Phono MC :  63 dB
Aux, Tuner or Tape Pb :  103 dB
Tone Control:
Bass :  ±10 dB at 100 Hz
Treble :  ±10 dB at 10 kHz
Low Filter:  -3 dB at 30 Hz , 6 dB/oct
Loudness:  +6 dB at 100 Hz; -4 dB at 10 kHz
Semiconductors:  42 Transistors, 38 Diodes, 13 LEDs, 6 FETs, 3 Ics
Power Source:  110/220/240 V 50/60 Hz AC
Power Consumption:  500 W
Dimensions (W x H x D):  430 x 141 x 387 mm (16-15/16" x 5-9/16" x 15-1/4")
Weight:  10,7 kg 923,6 lbs)

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