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.
Specifications
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
Circuitry:
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)