Optonica ST-3535 tuner

Outstanding Features

Multipath Detector Circuit

The ST-3535 incorporates a meter and terminals for an oscilloscope to detect multipath distortion and a built-in circuit to monitor its composition. The degree of multipath distortion is indicated by the meter, by the sound volume or by the waveform on the oscilloscope. Therefore, the antenna direction is easily and accurately reset. The circuit also improves FM listening and assures optimum recording.

Built-in Air Check Calibrator

This is a unique device for accurate "FM Air Check". Just flip on the switch and a level signal equivalent to that of the FM signal is generated. Then all you have to do is set the recording level to 0 VU on the deck.

Monolithic ICs are employed, Inter-station noise is eliminated by the muting switch

A hi-blend switch to reduce noise during reception of weak FM stereo signal

Variable audio output level control

Signal strength meter - this meter responses in proportion to the degree of signal intensity, thereby rendering effortless tuning under any condition

Easy-to-read-and-tune FM linear dial with a frequency-linear type variable capacitor, 8-11/16" wide scale, large flywheel and smooth tuning mechanism

FM signal input attenuator reduces distortion due to high signal input levels for stable FM reception

The FM antenna is equipped with dual terminals for 300 ohms or 75 ohms

Composite signal output terminal is provided for future possible FM 4-channel broadcasting

 

Outstanding Performance

Dual-gate MOS FETs and FM front end equipped with 4-gang linear tuning capacitor

The FM front end consists of a 4-gang capacitor that employs a double-tuned RF amplifier stage and a mixing stage. Remarkable performance characteristics such as 2,5 µV IHF sensitivity. 80 dB spurious response rejection ratio and 85 dB IF rejection ratio are attained. These figures assure high sensitivity and stable reception.

IF stage designed for high selectivity and interference protection

To obtain both ultra-low distortion characteristics and high selectivity, a phase linear ceramic filter and differential IC circuit are employed to make the phase characteristics at the IF stage linear. The band pass characteristics is also greatly improved.

PLL MPX circuitry

The PLL (phase-Locked Loop) circuit replaces the conventional coils and associated components with ultra-reliable integrated circuitry. The PLL circuit automatically compensates for phase-shift, thus ensuring stable separation for long periods of use.

A sub-carrier trap with inductive M-type filter is employed

 

Specifications

FM Section

Frequency Range: 87,6 - 108 MHz

Antenna Input:  75 Ω  (unbalanced); 300 Ω  (balanced)

Sensitivity (IHF)

Mono :  2,5 µV (300 Ω  antenna terminal)

Image Rejection:  80 dB

IF Rejection:  85 dB

Spurious Response Rejection:  80 dB

AM Suppression:  43 dB (mod. 30% AM by 1 kHz and 100% FM by 400 Hz)

Capture ratio:  1,5 dB

Selectivity:  65 dB (±400 kHz, 65 kHz Dev.)

Signal-to-Noise Ratio

Mono :  65 dB (75 kHz  Dev. 1 kHz)

Total Harmonic Distortion

Mono :  0,4% (75 kHz  Dev. 1 kHz)

Stereo :  0,8% (75 kHz  Dev. 1 kHz)

Stereo Separation

34 dB :  1 kHz, 75 kHz Dev.

25 dB :  50 Hz - 10 kHz

Frequency Response:  45 Hz - 13 kHz (±1,5 dB)

AM Section

Frequency Range:  520 - 1620 kHz

Antenna:  Built-in ferrite loopstick antenna AM external antenna terminal

Sensitivity:  400 µV /m (IHF, ferrite antenna)

Selectivity:  25 dB (at 1,000 kHz)

Signal-to-Noise Ratio:  35 dB

Image Rejection:  55 dB (at 600 kHz)

Total Harmonic Distortion :  1,5%

Audio Section

FM Output

Fixed :  0,5 V (1 kHz, 75 kHz Dev.)

Variable :  0 - 1,0 V (1 kHz, 75 kHz Dev.)

A Output

Fixed :  0,15 V (30% Mod.)

Variable :  0 -0 ,3 V (30% Mod.)

Composit Signal Out Terminal:  Yes

General

Semiconductors:  2 MOS FETs; 5 ICs plus 1 aux IC; 10 Transistors plus 16 aux Transistors; 6 Diodes plus 15 aux Diodes

Power Requirements:  AC 120 50/60 Hz

Power Consumption:  24 W

Dimensions (W x H x D):  17-3/8" x 5-5/8" x 15"

Weight:  2 lbs

 

Optonica ST-4405 tuner

Optonica ST-4405 in an AM/FM stereo tuner ; featuring a stereo beacon, LED FM center channel tuning indicator, 5-step LED signal strength indicator, and an FM Air Check 400 Hz output tone for presetting of a recorder's level controls. One set of variable line level outputs is provided.

The front panell hasonly one control: for tuning. The output level control is lockated on the rear apron. Front panel switches are provided for power, AM, FM mono, FM Auto (mono/stereo), FM muting, hi-blend (MPX noise filter), and Air Check.

The FM antenna input is 75/300 ohms. A rod antenna and external connection are provided for Am. One unswitched AC outlet is provided.

Performance

Full limiting was attained with 4,8 µV. For 300 Ω and "Tee" antennas the monophonic high fidelity sensitivity (60 dB quieting) measured 10 µV. The stereo high fidelity sensitivity 955 dB quieting) was 70 µV.

At standard test level the stereo frequency response measured +1/-1,8 dB from 20 to 15,000 Hz. Distortion depended on the tuning adjustment beacause the "center channel indicator" illuminates over a relatively large tuning range. Monophonic distrtion ranged from 0,15%  to 0,25%  T.H.D. stereo distortion ranged from 0,15% to 0,3% T.H.D. the Signal-to-Noise ratio measured 71 dB. Stereo separation was +40 dB . Selectivity was good.

The maximum output level corresponding to 100% modulation of the transmiter was 0,8 volts.

The Air Check output level was 0,55 volts; 3,5 dB below the stereo and mono output level corresponding to 100% modulation of the transmitter. For particularly clean recordings we suggest the recorder be adjusted to indicate no higher than -4 dB (below 0-VU/0-dB) when feeding the Air Check signal

Though stations can be received 9with considerable noise) below 3,4 µV input, the LED FM center channel indicator requires at least 3,4 µV before it turns on. The 5-step signal strength indicator requires at least 5,5 µV before the first (lowest value) step illuminates.

AM tuner performance is generally average, with higher than average sensitivity to signals on the high end of the dial.

Overall dimensions measured:  16-15/16" (wide), 2-21/32" (high); 15-1/2" (deep). 
Weight is 11 lbs.

Optonica CP-2511 HW

3-Way Mini Speaker System

Maximum input power:  120 W

Extra-large magnets are incorporated in all three drivers in this mini speaker system to ensure exceptional reproduction across a wide frequency range with high efficiency and low distortion. The high-quality 16,9 woofer is surrounded by a soft foam "collar" that ensures a flat response across the entire frequency range. The 3,0 cm soft dome midrange and 2,5 cm soft dome tweeter are designed to provide undistorted sound at required volume levels with a high degree of sensitivity. The combination of this dome construction and extra-large magnets also serves to improve directional characteristics in this quality mini speaker system.

Specifications

Type:  3-way closed type

Drivers

Woofer :  169 mm

Midrange :  30 mm

Tweeter :  25 mm

Power Handling Capacity

Music Input Power (DIN 45 500) :  120 W

RMS Input Power (DIN 45 573) :  70 W

Rated Impedance:  4 Ω

Frequency Response (DIN 45 500):  40 - 23,000 Hz

Sensitivity (at 98 dB/1m) :  10,7 W

Sound Pressure Lewel (1W/1m):  85 dB

Crossover Frequency:  1,2 kHz; 4,5 kHz

Resonsnce Frequency:  90 Hz

Volume:  9,7 litre

Dimensions (W x H x D):  350 x 230 x 195 mm

Weight:  6,8 kg

Front Grille :  detachable

Cabinet :  walnut finish

Optonica CP-2311HW

2-Way Mini Speaker System.

Maximum input power:  100W

The CP-2311 HW delivers constant, undistorted reproduction that is of unusually high quality for a speaker system of this size. The special design of the extra-large magnets used in the 2,5 cm tweter and 12,7 cm woofer ensures high efficiency plus low distortion. The soft-dome tweeter was developed to deliver sound at the desired volume level without distortion. This construction also acts to improve directional characteristics. Superior reproduction in the low and mid frequency ranges is also ensured by the soft PVC :collar" that surrounds the high-efficiency woofer in this mini speaker system

Specifications

Type:  2-way closed type

Drivers

Woofer :  127 mm

Tweeter :  25 mm

Power Handling Capacity

Music Input Power (DIN 45 500) :  100 W

RMS Input Power (DIN 45 573) :  50 W

Rated Impedance:  4 Ω

Frequency Response (DIN 45 500):  45 - 23,000 Hz

Sensitivity (at 98 dB/1m) :  14,8 W

Sound Pressure Lewel (1W/1m):  83,5 dB

Crossover Frequency:  1,8 kHz

Resonsnce Frequency:  80 Hz

Volume:  4,8 litre

Dimensions (W x H x D):  300 x 130 x 160 mm

Weight:  4,0 kg

Front Grille :  detachable

Cabinet :  walnut finish

Optonica RP-5100 turntable

Direct Drive Stereo Turntable

The first step in ensuring performance stability in the RP-5100 was inclusion of the durect drive system with its FG servo Mono Torque DC coreless motor. This precision drive system suppresses rumble and cogging while ensuring rotational speed precision and a prolonged service life. A separate tonearm motor helps maintain this rotational precision while increasing tonearm trackability. The design of the statically-balanced J-shaped tonearm serves as an inside force canceller while enhancing trackability. To ensure extra precision in rotational speed control, a stroboscope was built into the Rp-5100 to detect even small fluctuations in speed and to compensate for them instantly. The pitch control, in combination with the stroboscope, can be employed to make fine adjustments in the turntable rotating speed.

Specifications

Type:  full-automatic

Motor:  DC core-less motor with FG (Frequency generator) Servo control system

Drive System:  Direct-drive system

Turntable Platter :  aluminum die-cast

Platter Diameter:  300 mm

Speed:  33-1/3 and 45 rpm

Speed Control Range :  ±4%

Wow and Flutter:  ±0,06% (DIN 45 500);  0,04% WRMS (JIS C-5521)

Rumble:  45 dB (DIN A);  65 dB (DIN B)

Tonearm Type:  Static-balanced J-shaped pipe-arm

Effective length:  210 mm

Overhang:  11 mm

Off-Set-Angle:  19°

Cartridge Weight Range:  4 - 12 g

Stylus Pressure Range:  1 - 3 g

Type:  VM cartridge type

Output Level:  3 mV

Frequency Response:  20 Hz - 20 kHz

Channel Separation:  20 dB

Channel Balance:  3 dB

Recommended Load Impedance:  47 k Ω, 100 pF

Weight:  5,5 g

Recommended Stylus Pressure:  2 g

Power Source:  110, 20, 240 V 50/60 Hz AC

Power Consumption:  12 W

Dimensions (W x H x D):  480 x 108 x 384 mm

Weight:  8,5 kg

Finish color: Silver (H) , Brown (HB)

I like

Optonica RP-5200 turntable

Optonica RP-5200 Double Direct Drive Stereo Turntable

With its direct drive tonearm motor, the RP-5200 has greatly anhanced tonearm trakking accuracy, while the direct drive DC turntable motor assures extra-steady platter rotation. The direct drive tonearm system floats the tonearm over a record and then gently lets it down on the record at the touch of a control switch. For extra protection, the solenoid will immediately lift the tonearm from the record if any malfunction occurs. With soft-touch controls plus a microprocessor to offer computer accurate control of all turntable features, instant response to all commands is ensured. A statically-balanced straight tonearm provides just the right stylus pressure and trackability. A convenient repeat key allows you to listen to arecord again without having the tonearm return to the resting position.

Specifications

Type:  full-automatic

Motor:  DC core-less motor with FG Servo control system

Drive System:  Direct-drive system

Turntable Platter :  aluminum die-cast

Platter Diameter:  300 mm

Speed:  33-1/3 and 45 rpm

Speed Control Range :  ±4%

Wow and Flutter:  ±0,06% (DIN 45 500);  0,04% WRMS (JIS C-5521)

Rumble:  45 dB (DIN A);  65 dB (DIN B)

Tonearm Type:  Static-balanced straight tonearm

Effective length:  215 mm

Overhang:  16 mm

Off-Set-Angle:  23°

Cartridge Weight Range:  4 - 8 g

Type:  VM cartridge type

Output Level:  3 mV

Frequency Response:  20 Hz - 20 kHz

Channel Separation:  20 dB

Channel Balance:  2 dB

Recommended Load Impedance:  47 k Ω

Weight:  5,5 g

Recommended Stylus Pressure:  2 g

Power Source:  110, 20, 240 V 50/60 Hz AC

Power Consumption:  10 W

Dimensions (W x H x D):  430 x 106 x 345 mm

Weight:  5 kg

Finish color: Silver (H) , Brown (HB)

I like

Optonica RT-5200 deck

Optonica RT-5200 Stereo Cassette Tape Deck with 2-Motor drive System and Microprocessor Full Logic Solenoid Control System.

Convenience and performance are uaranteed by the microprocessor full logic solenoid transport control providing greater reliability with smoother, softtouch control of complex tape transport functions. The 2-motor drive system adds to performance by assuring speed stability. For added convenience, APSS permits one-touch skipping or repetition of desired selections. The automatic spacing function allows blank spaces to be inserted for use with APSS. Dolby Noise Reduction significantly improves the Signal-to-Noise ratio, while the MPX filter removes any remaining pilot signal from FM broadcasts. Metal tape capability lets you take full advantage of the superior performance ensured by metal tapes,while a 4-position tape selector facilitates setting for optimum performance with CrO₂, FeCr and normal tapes as well as metal tape. A fluorescent peak level display is also provided for extra monitoring ease.

Specifications

Motor:  2 motor drive system

Capstan Drive :  Electronically-controlled DC motor

Reel Drive :  High torque DC-motor

Heads:

Record/Playback :  hard permalloy

Erase :  Double-gap ferrite

Wow and Flutter:  ±0,18% (DIN 45 500);  0,058% WRMS

Tape Speed Deviation:  ±1,5%

FF/REW Time :  110 sec (C-60)

Frequency Response:

Normal Position :  40 - 13,000 Hz (±3 dB); 40 - 14,000 Hz (DIN 45 500)

CrO₂ Position :  40 - 15,000 Hz (±3 dB);  40 - 16,000 Hz (DIN 45 500)

Fe-Cr Position :  40 - 15,000 Hz (±3 dB):  40 - 16,000 Hz (DIN 45 500)

Metal Position :  40 - 16,000 Hz (±3 dB): 40 - 17,000 Hz (DIN 45 500)

Signal-to-Noise Ratio (Fe-Cr Tapes):

Dolby NR off :  56 dB

Dolby NR on :  66 dB at over 5 kHz

Recording System:  AC bias (105 kHz)

Erase System:  AC erase (105 kHz)

Input Sensitivity/Impedance:

Mic :  0,2 mV/ 6,8 k Ω

Line -In :  50 mV/ 50 k Ω

Rec/Pb (DIN) :  0,2 mV/ 6,8 k Ω

 Output Level/Impedance:

Line-Out :  710 mV/50 k Ω at 0 dB

Rec/Pb (DIN) :  710 mV/50 k Ω at 0 dB

Headphones :  89 mV/ 8 Ω at 0 dB

Power Source:  110, 220, 240 V 50/60 Hz  AC

Power Consumption:  30 W (at 220 V)

Dimensions (W x H x D):  430 x 95 x 320 mm

Weight :  5,8 kg

I like

Optonica ST-5200 tuner

Optonica ST-5200

FM/LW/MW Stereo Synthesizer  Tuner with Microprocessor Tuning System

The synthesizer tuning system employed in this 3-band stereo tuner minimizes error and drift by breaking down a reference frequency and using it to synthesize the tuning frequency. As aresult, extremely stable, highly accurate reception is ensured. An easy-to-read digital frequency tuning display indicates the tuned frequency to enable pinpoint tuning accuracy. The auto search tuning system allows the synthesizer to be set to stop automatically at the nearest station in the chosen direction for effortless tuning. 10 presettable station memories can be set for one-touch tuning of favourite station. LED tuning meters facilitate pinpoint tuning accuracy and, when used with the FM air check calibrator, allow simplified setting of deck input levels for FM recordings. Soft-touch controls assure smooth operation.

Specifications

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.):  40 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:  9 kHz

Automatic Tuning:  yes

Pre-Setting Station:  FM/AM total 10

Sensitivity

MW :  350 µV/m (Signal-to-Noise 20 dB, 1000 kHz)

LW :  350 µV/m (Signal-to-Noise 10 dB, 220 kHz)

Audio Section

FM Output (40 kHz dev.):  350 mV (fixed)

AM Output (30% mod.):  200 mV (fixed)

General

Power Sourece:  110/220/240 V 50/60 Hz AC

Power Consumption:  18 W (220 V)

Dimensions (W x H x D):  430 x 75 x 393 mm

Weight:  5,0 kg

I like

Optonica SM-5200 amplifier

Optonica SM-5200 Integrated Stereo Amplifier

The amplifier for the 5200 Series offers the type of circuitry and features usually found in the more sophisticated models. ITL/OTL/OCL (input transformerless/output transformerless/output capacitorless) power amp circuitry helps keep distortion to a minimum, while improving amplifier performance, even with the ample power rating of this unit. The SM-5200 is equipped with a 4-position speaker switch enabling a variety of listening arrangements with two speaker systems, a loudness switch for natural-sounding performance at low volume levels, a subsonic filter for extra audio clarity and mode switch for monaural as well as stereo reproduction. For extra ease, LEDs indicating the operating status of each pushbutton are provided on the front panel.

Specifications

Amplifier Section

Music Output Power: 

2 x 68 W at 4 Ω (0,09% Total Harmonic Distortion)

2 x 45 W at 8 Ω (0,09% Total Harmonic Distortion)

Continuous Output Power (RMS, both channel driven) At 1 kHz :

2 x 40 W (4 Ω, 0,09% T.H.D.)

2 x 33 W (8 Ω, 0,09% T.H.D.)

Continuous Output Power (RMS, both channel driven) from 20 Hz to 20 kHz:

2 x 38 W (4 Ω, 0,15% T.H.D.)

2 x 30 W (8 Ω, 0,09% T.H.D.)

Total Harmonic Distortion:

Rated Power :  0,09%

Half Power :  0,03%

Power Pandwidth (IHF):  10 Hz - 30 kHz (0,15% T.H.D.)

Frequency Response

Phono:  (±0,4 dB) RIAA curve Deviation

Tuner, Aux, Tape :  10 Hz - 65 kHz (+1 dB, -3 dB)

Damping Factor (1 kHz, 4 Ω):  20

Signal-to-Noise Ratio (IHF-A): 

Phono:  70 dB

Aux : 90 dB

Phono Overload Level (1 kHz):  150 mV RMS

Tone Control

Bass :  ±10 dB at 100 Hz

Treble :  ±10 dB at 10 kHz

Loudness Control:  +6 dB at 100 Hz ; +4 dB at 10 kHz

Filter Low :30 Hz (-6 dB/oct)

Input Sensitivity/Impedance:

Phono :  2,3 mV / 47 k Ω; 120 pF

Aux, Tuner, Tape :  150 mV/47 k Ω

Output Level/Impedance

Speakers :  A, B (4 - 16 Ω);  A+B(8 - 16 Ω)

Headphones :  Low Impedance (4 - 16 Ω)

Tape (Chinch) :  150 mV/47 kΩ

Tape (DIN) :  60 mV/ 82 k Ω

General Section

Power Source:  110/220/240 V, 50/60 Hz AC

Power Consumption:  330 W (220V)

Dimensions (W x H x D):  430 x 75 x 382 mm

Weight:  7,7 kg

I like

Optonica RP-105H turntable

Optonica RP-105H

Fully-automatic Stereo Turntable with Double Direct Drive System

For superior performance, greater reliability and easier operation, electronic control systems are used throughout the RP-105H. Separate direct drive platter and tonearm motors assure extrastable platter rotation plus maximum tonearm trackability. An electronic servo control maintains platter speed precision, while a microprocessor controls the operation of the tonearm. When the unit is turned off, a solenoid supports the tonearm and locks it in place. Electronic control systems are also used to protect the stylus in case of power failure and to handle cuieing operations. The RP-105H also features remote control mode selection plus play/cue functions. The stylus is protected and extra operating procedures are eliminated by the auto record size/presence detector.

Specifications

Type:  full-automatic

Motor:  FG Servo motor

Drive System:  Direct-drive system

Turntable Platter :  aluminum die-cast

Platter Diameter:  300 mm

Speed:  33-1/3 and 45 rpm

Speed Control Range :  ±4%

Wow and Flutter:  ±0,06% (DIN 45 500);  0,04% WRMS (JIS C-5521)

Rumble:  47 dB (DIN A);  65 dB (DIN B)

Tonearm Type:  Static-balanced S-shaped tonearm

Effective length:  215 mm

Overhang:  16 mm

Off-Set-Angle:  23°

Cartridge Weight Range:  4 - 10 g

Stylus pressure Range:  1 - 3 g

Type:  Magnetic type

Output Level:  7 mV

Frequency Response:  20 Hz - 20 kHz

Channel Separation:  20 dB

Channel Balance:  3 dB

Recommended Load Impedance:  47 k Ω

Weight:  4,5 g

Recommended Stylus Pressure:  2 g

Power Source:  110, 20, 240 V 50/60 Hz AC

Power Consumption:  10 W

Dimensions (W x H x D):  430 x 120 x 355 mm

Weight:  7 kg

I like

Optonica RT-105H Tape-Deck

Optonica RT-105H

Stereo Cassette Tape-Deck with Microcomputer Full Logic Control System

Greater reliability and convenience in the transport system of the RT-105H are brought about by digital control technology. A microcomputer-controlled full logic system not only makes operation easier for you, it also makes it easier on the deck's transport mechanism through soft-touch control and direct switching of modes. APSS is provided for one-touch skipping or repetition of desired selections, while the auto space control uses digital circuitry for the insertion of blank spaces between songs. A high-performance hard permalloy head ensures optimum performance with all types of tapes, including metal. Performance and convenience are further assured with Dolby Noise Reduction circuitry, full-function remote control and peak level meters.

Specifications

Motor:  Electronically-controlled DC motor for reel drive

Heads:

Record/Playback :  hard permalloy

Erase :  Double-gap ferrite

Wow and Flutter:  ±0,20% (DIN 45 500);  0,07% WRMS

Tape Speed Deviation:  ±2%

FF/REW Time :  10 sec (C-60)

Frequency Response:

Normal Position :  40 - 13,000 Hz (±3 dB); 40 - 14,000 Hz (DIN 45 500)

CrO₂ Position :  40 - 15,000 Hz (±3 dB);  40 - 16,000 Hz (DIN 45 500)

Fe-Cr Position :  40 - 15,000 Hz (±3 dB):  40 - 16,000 Hz (DIN 45 500)

Metal Position :  40 - 16,000 Hz (±3 dB): 40 - 17,000 Hz (DIN 45 500)

Signal-to-Noise Ratio (Fe-Cr Tapes):

Dolby NR off :  56 dB

Dolby NR on :  66 dB at over 5 kHz

Recording System:  AC bias (105 kHz)

Erase System:  AC erase (105 kHz)

Input Sensitivity/Impedance:

Mic :  0,2 mV/ 6,8 k Ω

Line -In :  50 mV/ 50 k Ω

Rec/Pb (DIN) :  0,2 mV/ 6,8 k Ω

 output Level/Impedance:

Line-Out :  550 mV/50 k Ω at 0 dB

Rec/Pb (DIN) :  550 mV/50 k Ω at 0 dB

Headphones :  40 mV/ 98 Ω at 0 dB

Power Source:  110, 220, 240 V 50/60 Hz  AC

Power Consumption:  25 W (at 220 V)

Dimensions (W x H x D):  430 x 95 x 320 mm

Weight :  5,9 kg

Remote Control :  Yes

I like

Optonica SM-105H

Optonica SM-105H

Straight DC Stereo Integrated Amplifier with Fully Electronic Control System

This perfectly "straight" amp is a result of Optonica's efforts to provide a fully digital system based on a lead-less and contact-less design. A combination of fully direct-coupled amplifier circuitry and fully electronic controls for tone, volume and balance completely eliminated the use of lead wires to improve frequency response. Conventional mechanical controls were replaced with electronic circuitry to eliminate contacts. Microcomputer-controlled circuitry splits up the signal to ensure more precise tone control and offer a wider dynamic range, better Signal-to-Noise ratio, lower distortion and greater durability.

A full remote control system, unique graphic displays and an innovative sound memory system were added to match the outstanding performance of this amp.

Specifications

Amplifier Section

Music Output Power: 

2 x 77 W at 4 Ω (0,01% Total Harmonic Distortion; -22 dB Att)

2 x 60 W at 8 Ω (0,08% Total Harmonic Distortion; -22 dB Att)

Continuous Output Power (RMS, both channel driven) At 1 kHz :

2 x 50 W (4 Ω, 0,01% T.H.D.; -22 dB Att)

2 x 40 W (8 Ω, 0,08% T.H.D.; -22 dB Att)

Continuous Output Power (RMS, both channel driven) from 20 Hz to 20 kHz:

2 x 45 W (4 Ω, 0,05% T.H.D.; -22 dB Att)

2 x 37 W (8 Ω, 0,02% T.H.D.; -22 dB Att)

Total Harmonic Distortion:

Rated Power :  0,01% (-22 dB att)

Half Power :  0,01% (-22 dB att)

Power Pandwidth (IHF):  10 Hz - 35 kHz (0,1% T.H.D.; -22 dB Att)

Frequency Response

Phono:  40 Hz - 20 kHz (±0,3 dB) RIAA curve Deviation

Tuner, Aux, Tape :  7 Hz - 100 kHz (+0 dB, -3 dB)

Damping Factor (1 kHz, 4 Ω):  20

Signal-to-Noise Ratio (IHF-A): 

Phono:  78 dB

Aux : 95 dB

Phono Overload Level (1 kHz):  130 mV RMS

Tone Control

Bass :  ±8 dB at 100 Hz

Treble :  ±8 dB at 10 kHz

Audio Mutting:  ATT -50 dB (fixed)

Input Sensitivity/Impedance:

Phono :  2,3 mV / 47 k Ω; 120 pF

Aux, Tuner, Tape :  140 mV/10 k Ω

Output Level/Impedance

Speakers :  A, B (4 - 16 Ω)

Headphones :  Low Impedance (4 - 16 Ω)

Tape (Chinch) :  150 mV/220 Ω

Tape (DIN) :  45 mV/ 80 k Ω

General Section

Power Source:  110/220/240 V, 50/60 Hz AC

Power Consumption:  400 W (220V)

Dimensions (W x H x D):  430 x 95 x 320 mm

Weight:  7,8 kg

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.

Specifications

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

Sensitivity

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)

General

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