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





Marantz PM-8 amplifier


Stereo Control Console
Features Preamplifier Section:
Transient Intermodulation Distortion (TIM) design and controll versatility. Like the SM-7 and SC-7, features design parts specifically created to combat transient intermodulation distortion.
Low Noise and Low Distortion phono Equalizer
The Input is a cascade defferential formed of low-nooise FET's, followed by a complete push-pull amp and Darlington-connected SEPP output. The entire phono equalizer circuit in PM-8 is DC for low distortion, low-TIM performance and better transient response.
Pre-preamp for MC cartridges, the built-in pre-amp is DC using low noise Fets at the input. S/N ratio is extremely good thanks to low-impedance negative feedback circuitry.

Features Power Section
Powerful low-TIM performance. Marantz use DC configurationthrought and improved every circuit part for combat Transient Intermodulation Distortion, TIM
Marantz use high speed power transistors created to our specifications and still more important, and improved open-loop response to enable us to use a lower amount of negative feedback thereby reducing the more ordinary forms of distortion.
Low Noise and High Output configuration. The input of the Pm-8 is formed of a differential Dual FET with matched thermal characteristics. Next is a duall FET differential  amp. An emitter/follower buffer and a 3 stage darlington-connected output, ending in a parallel push-pull circuit. This latter circuit is formed of an array of EBTs (Emitter - Ballast - Transistor) with superb performance characteristics, both in high power output and high speed switching.
Separate power Supplies, Left ann Right channels receive power from separate supplies. The predriver and power output sections each have their own transformer. To further assure a constant energy supply a quartet of massive 15,000 µF capacitors are used.

Specifications:
Power Output (rating per channel)
320 W at 4 Ω DIN
270 W at 4 Ω RMS
200 W at 8 Ω DIN
190 W at 8 Ω RMS
Total Harmonic Distortion (RMS, 8 Ω):  0,03%
Intermodulation Distortion:  0,03%
Dampingg Factor:  100
Main In Sensitivity/Impedance:  1,5 V/30  k Ω
Frequency Response:  DC 100 Hz-kHz
Signal-to-Noise Ratio Main In:  125 dB
MM Cartridge Input
Frequency Response (RIAA):  ±0,2 dB
Signal-to-Noise Ratio:  90 dB
Input Impedance:  1/100/27/47 k Ω
Input Capacity:  200 pf
Input Sensitivity:  2 mV
Equivalent Noise at Input:  0,24 µV
Dynamic Range:  125 dB
Moving Coil Cartridge Input
Input Sensitivity/Impedance:  200 µV/ 10/47/100/220 Ω
Aux. Input Sensitivity/Impedance:   150 mV/40 k Ω
Frequency Response:  5 Hz -100 kHz
Signal-to-Noise Ratio:  105 dB
Output Voltage:
Tape Out ;  415 mV
Preamp Out :  1,5 V
Output Impedance
Tape Out :  250 Ω
Preamp Output :  100 Ω
 dimensions (W x H x D):  416 x 146 x 437 mm
Weight:  26 kg
Finish : Walnut Cabinet


Luxman R-351 receiver


Digital Synthesized AM/FM Stereo Receiver
Luxman's audio excellence combines with todays computer intelligence in the new System Bus to bring you the heart of a totally integrated system. The R-351 features a robust 55 watts per channel. Convenience features include full system remote control, computer analuzed tuning, CD Syncro recording, record Out selector and a variable sleep timer. Multi-room system remote control is available with infrared or in-wall keypad operation. As with every "300" Series unit, the System Bus computer control offers the simplest method of operating your system ever. Also Duo beta, STAR Circuit, Voltage Driven Amplification, pre-amp Out.

Features:
20 Random Station memories - A total of 20 AM and /or FM stations can be memorized in any random pattern. Any station can be instantly recalled by touching the appropriate random station preset button without any need to change the Am or FM Input Selector, and the 20 stations can be recalled by local or remote control
Computer Store - This feature allows the internal computer of the R-351 to automatically store a series of FM or AM station in the 20 preset memory locations. The automatic storing sequence may be started at the first or any subsequent memory position and from any chosen frequency position on the FM or AM band.

Auto-Seek FM/AM Tuning - Allows automatic tuning of all stations (except weak stations below the muting level) on a station-by-station basis. This eliminates the tedium of manually fine tuning every station.
Specifications
Amplifier Section
Power Output : 55 W (8 Ω load, 20 -20,000 Hz)
Distortion:  0,08% (8 Ω load, 20 - 20,000 Hz)
Input Sensitivity/impedance:  150 ±30 mV /35 k Ω (ref. 1 kHz)
Frequency response:  10 Hz - 50 kHz (-3 dB, ref. 1 kkhz)
Signal-to-Noise ratio:  82 dB (500 mV input)
Tone Controls:
Bass (at 100 Hz) :  ±10 ±2 dB
Treble (at 10 kHz) :  ±10 ±2 dB
Residual Noise:  2 mV
Crosstalk:  60 dB 9ref. 1 kHz)
Separation:  56 dB (ref. 1 kHz)
Phono Section
Input Sensitivity/Impedance:  2,5 ±0,5 mV/47 k Ω
Frequency Response:  100 Hz - 10 kHz (±1,5 dB, ref. 1 kHz)
Signal-to-Noise Ratio:  74 dB (5 mV Input)
Crosstalk:  60 dB 9ref. 1 kHz)
Separation:  55 dB (ref. 1 kHz)
FM Section
Intermediate Frequency:  10,7 MHz
Frequency Range:  87,5 - 108 MHz
Usable Sensitivity:   25,2 dBf
50 dB Quieting Sensitivity (stereo):  52,2 dBf
Signal-to-Noise Ratio (stereo):  66 dB
Distortion (stereo):  0,5%
Frequency Response:  30 Hz - 15 kHz ±2,5 dB
Image rejection:  60 dB
If Rejection:  65 dB
Stereo Separation (stereo):  37 dB (ref. 1 kHz)
MW, AM Section
Intermediate Frequency:  450 kHz
Frequency Range:  522 - 1611 kHz
Usable Sensitivity (20 dbS/N):  73,2 dBf
Signal-to-Noise Ratio:   45 dB
Distortion:  1,5%
Image Rejection:  28 dB
Frequency Response:  100 Hz - 2 kHz (-3 ±3 dB)
LW Section
Intermediate Frequency:  450 kHz
Frequency Range:  153 - 281 kHz
Usable Sensitivity (20 dbS/N):  89,2 dBf
Distortion:  1,5%
Image Rejection:  28 dB
IF Rejection:  25 dB
General Section
Semiconductors:  20 ICs; 58 Transistors; 46 Diodes; 3 Zener Diodes; 1 FET
Power Supply:  Ac 120/220/240 V 50/60 Hz
Dimensions (W x H x D):  438 x 115 x 330 mm
Weight:  9 kg



Luxman LV-112 amplifier

Luxman Integrated Amplifiers all employ voltage-driven amplification for optimum dynamic performance with negligible transient intermodulation or slew induced distortion. In addition all use High Energy power supplies with high filter capacitance to provide the steady state and dynamic power necessary for proper reproduction of even the most demanding musical transients.

The LV-112 presents such Luxman features as a subsonic filter to remove very low frequency components resulting from warped records, tone arm resonances or other causes, and "Line Straight" which bypasses tone and other controls for the shortest direct path to the power amplifier ensuring the best possible fidelity, imaging and sonic impact.

Specifications
Rated Continuous Power Output:  55 W per channel (20-20,000 Hz, 8 Ω at rated T.H.D.)
Dynamic Power Output:  120 W at 4 Ω; 150 W at 2 Ω
Peak Short-Circuit Current:  25 A (400 Hz toneburst, 5% duty cycle)
Total Harmonic Distortion:  0,05% (20-20,000 Hz, 8 Ω Full Power)
Intermodulation Distortion:  0,02% (60 Hz : 7 kHz = 4:1, 8 Ω, Full Power)
Signal-to-Noise Ratio:
Phono :  84 dB (re 5mV)
CD, Tape, Video :  95 dB (re 0,5V)
Frequency Response:
Phono (RIAA) :  20 Hz - 20,000 Hz ±0,5 dB
CD, Tape, AV, AUX :  6,5 Hz - 150,000 Hz (at -3 dB)
Power Supply: 110 - 120, 220 - 240 V 50/60 Hz
Dimensions (W x H x D): 17-1/4" x 5-3/8" x 14-3/8"
Weight:  19,8 lbs


Sony PS-1700 turntable


Stereo Turntable
The PS-1700 is a new introduction to our range of stereo turntables, incorporating belt drive and a high sensitvity static balanced tone arm. It comes complete with a Sony cartridge.
Features
Automatic arm return and stop
Belt driven alluminium die-cast turntable
High signal to noise ratio, low wow and flutter
Precision pivot bearings and bias compensator for low distortion.

Specifications
Type:  semi-automatic
Platter Diameter:  300 mm (11-13/16")
Speeds:  33-1/3 and 45 rpm
Drive System:  belt-drive
Motor:  4-pole semi-synchronous
Speed Control Range:  fixed (allowance ±2%)
Wow and Flutter:  less than 0,08% DIN 0,06% WRMS
Signal-to-Noise Ratio:  63 dB DIN
Tone-arm Type:  Static balanced
Overal Arm Length: 300 mm (11-13/16")
Pivot to Stylus:  8-1/2 inches (216,5 mm)
Overhang:  21/32 inch (15,5 mm)
Trackening Error:  +3° -1°
Stylus Force adj. Range:  0 - 3 g
Anti-skating adj. Range:  0 - 3 g
Shell Weight:  7,5 g
Cartridge Weigt Range:  4 - 8 g
Cartridge Type:  VL-32 G
Channel Separation:  25 dB at 1 kHz
Output Voltage:  4 mV at 1 kHz, 3 mV at 1 kHz
Load Impedance:  50 - 100 k Ω (50 k Ω recommended)
Tracking Weight:  2 g recommended
Stylus:  ND 135G conical, 0,5 mil diamond
Power Requirements:  AC 110, 127, 220 and 240 V 50/60 Hz
Dimensions (W x H x D):  445 x 160 x 370 mm (17-1/2" x 6-1/4" x 14-5/8")
Weight:  7,4 kg (16,5 lbs)


Sony PS-1350 turntable

Stereo turntable
PS-1350 will add both quality and style to your existing Hi-Fi system. Coming complete with Sony magnetic cartridge and detachable dust cover.
Features:
Semi-automatic belt driven turntable
Anti-skating and cueing facilities
Fitted magnetic cartridge
Newly designed disc mat effectively dampening disc vibration.

Specifications
Type:  semi-automatic
Platter Diameter:  300 mm (11-13/16")
Speeds:  33-1/3 and 45 rpm
Drive System:  belt-drive
Motor:  4-pole semi-synchronous
Speed Control Range:  fixed
Wow and Flutter:  ±0,08% DIN 0,06% WRMS
Signal-to-Noise Ratio:  63 dB DIN
Tone-arm Type:  Static balanced
Overal Arm Length: 300 mm (11-13/16")
Pivot to Stylus:  8-1/2 inches (216,5 mm)
Overhang:  21/32 inch (15,5 mm)
Trackening Error:
Stylus Force adj. Range:  0 - 3 g
Anti-skating adj. Range:  0 - 3 g
Shell Weight:  7,5 g
Cartridge Weigt Range:  4 - 12,5 g
Cartridge Type:  VL-32 G magnetic
Channel Separation:  25 dB at 1 kHz
Output Voltage:  3 mV at 1 kHz, 5 cm/sec
Load Impedance:  50 k Ω recommended
Tracking Weight:  1,5 - 2,5 g (recommended 2g)
Stylus:  ND 135G conical, 0,5 mil diamond
Power Requirements:  AC 110, 127, 220 and 240 V 50/60 Hz
Dimensions (W x H x D):  450 x 17-0 x 380 mm (17-3/4" x 6-3/4" x 15")
Weight:  7,7 kg (17 lbs)


McIntosh MC-60


The Mcintosh Model MC-60 is a 60 watt high fidelity power amplifier designed for home entertainment systems and professional applications where high power and distortion free performance is required. The Model MC-60, like all other McIntosh power amplifiers. Uses the exclusive McIntosh high efficiency output circuit and bifilar output transformer to obtain the high standard of performance found in this amplifier.
Some of the more important characteristics of the amplifier are less than 1/3% harmonic distortion at any power output up to 60 watts and at any frequency in the audio spectrum, 20 to 20,000 cps; less than 1/2% intermodulation distortion for all power levels up to 120 instantaneous peak watts; and noise and hum level 90 dB or more below the rated output level.

The MC-60 has two high impedance inputs and many be operated from any signal source deliviring 0,5 volts or more, or directly from a McIntosh Audio Compensator or pre-Amplifier such as the  Models C-4, C-8, C-104 or C-108.
Output impedances of 4, 8 and 16 ohms are provided for direct connection to loudsapeakers. An additional 600 Ω output is present for use with lines.

Specifications
Power Output:  60 watts continuous
Input Level:
Input 1 :  0,5 volts to 30 volts, with gain control
Input 2 :  2,5 volts (for use with McIntosh Audio Compensators and pre-Amp)
Frequency Range: 
20 to 30,000 Hz ±0,1 dB at 60 watts output
16 to 60,000 Hz ±0,5 dB at 60 watts output
10 to 1000,000 Hz ±1,0 dB at 30 watts output
Total Harmonic Distortion:  less than 1/3% at 60 watts output or less, 20 to 20,000 Hz
Intermodulation Distortion:  less than 1.2% if instentaneous peak power is below 120 watts
Impulse Distortion:  Negligible
Noise and Hum level:  90 dB or more below rated output
Damping Factor:  15 or better for 4, 8 and 16 Ω output, 20 for 600 Ω
Input Impedance:
0,5 meg for 0,5 volt input
0,13 meg for 2,5 volt input
20 cycles to 40,000 cycles
Output Impedance:
4, 8, 16 and 600 ohms (600 ohmis balanced to ground)
Phase Shift:  ±8° 20- 20,000 Hz
Tube Complement:
Rectifier :  2-5U4GA
Pre-Amp :  12 AX7
Phase Inverter : 12AU7
Voltage Amp : 12BH7
Driver : 12AX7
Output : 2-6550
Dimensions (W x H x D):  14" x 10" x 8"
Weight:  41 pounds net
Finish :  chrome and black


Denon PMA-720 AE


The PMA-720AE is equipped with an Advanced HC (High-Current) Single Push-Pull Circuit that enforces Denon’s design concept for pure audio amplification. This design ensures that you hear delicate musical details, reliably supported by plenty of power. Playback faithful to the original sound is also made possible by a circuit board layout that can handle the greater power from the amplifier section and appropriately respond to the output level and unique character of the signal. In addition, the internal construction of the PMA-720AE has been carefully designed to prevent unwanted vibration from adversely affecting the audio signal.

Features:
Advanced High Current (AHC) Single-Push-Pull Circuit for musical detail and power
High-speed, high-capacity power supply circuit for AHC Single-Push-Pull
Wide dynamic range, supporting high-grade audio sources
Main transformer with separate power supplies for audio and control circuits
New higher quality speaker terminals – two pairs
The Micro-processor
Newly-designed remote unit

Specifications:
Rated output :
50 W + 50 W at (8 Ω , 20 Hz - 20 kHz, THD 0.07 %)
85 W + 85 W at (4 Ω , 1 kHz, THD 0.7%)
Total Harmonic Distortion;  0.01% (8 Ω , 1 kHz)
Preamplifi er Section
Input Sensitivity/Impedance:  120 mV / 47 kohms
Frequency Response: 10 Hz - 100 kHz — +1, –3 dB (DIRECT mode)
Signal-to-Noise  Ratio:  107 dB (IHF-A weighted, DIRECT mode)
Line ;  107 dB
Phono :  86 dB
Power Supply:  AC 230 V, 50 Hz
Power Consumption:  200 W (Standby 0.3 W, CEC standby 3 W)
Dimensions (W x H x D): 434 x 121 x 308 mm
Weight:  7.1 kg


Denon DCD-720 AE


CD-Player with Front-USB
The DCD-720AE CD Player is endowed with plenty of acclaimed Denon audio technology to give you a quality of sound you would normally expect only from higherpriced models. It also has a USB port for digital input from an iPod or USB memory.
The DCD-720AE’s exceptional sound quality is produced by a combination of Denon’s analog waveform recreation technology called AL32 Processing, highly accurate 32bit /192kHz D/A converter (DAC), and DAC master clock design.

Features:
Advanced AL32 Processor and high-precision32-bit, 192- kHz D/A converters, to reproduce the original sound
USB port for playback from an iPod or USB memory
Vibration-resistant design with Direct Mechanical Ground Construction
Original Denon Mechanism with central assembly drawer unit
Carefully designed construction to preserve audio signal
Minimum signal path design
2 line fluorescent display
Strictly selected parts for high sound quality
Pure Direct to preserve pure

Specifiactions:
CD section
Channels:  2 channel stereo
Dynamic Range:  100 dB
Signal-to-Noise Ratio:  110 dB
Total Harmonic Distortion:  0.0025% (1 kHz)
General
Power Supply: AC 230 V, 50 Hz
Power Consumption: 22 W
Dimensions (W x H x D):  434 x 107 x 279 mm
Weight:  4.2 kg


Kenwood GE-930 equalizer


Electronic 14-Band Graphic Equalizer/Spectrum Analyzer
14-Band graphic equalizer with ±12 dB variable range
Two fluorescent spectrum analyzer displays with level adjustor
10 equalizer memory presets (5 programmable, 5 built-in)
System remote controllable (effect memory)
Microphone mixing

Reverse mode

Kenwood GE-770


Stereo Graphic Equalizer with Spectrum Analyzer

10 bands
12 dB cut or boost per band
Independent L/R channel ad0justment with slide controls
EQ on/off switch for comparisons
Normal/Reverse switch acts as simple nooise reduction
10 band spectrum analyzer with large fluorescent display
L/R independent or L + R channel spectrum display
Easy operation with graphic display of status
Two tape channels with monitoring
Dimensions (W x H x D):  16-11/20" x 5-3/8" x 12-5/16"
Weight:  10,6 lbs (net)

Akai SW-155



Akai SW-155
Drivers:
12" Roll Edge Woofer
5" Midrange
2,5 tweeter,
2" Horn Type Super Tweer
Impedance :  8 ohms
Max. Power Input:  50 W
Frequeency response:  52 to 21,000 Hz
Dimensions (W x H x D):  406 x 640 x 300 mm ( 16" x 25",25 x 11,75")
Weight:  17,6 kg (35,2 lbs)  each

Akai SW-145

Akai SW-145
Specifications:
Drivers:
12" Roll Edge Woofer
5" Midrange
2,5" tweeter
2" Horn Type Super Tweeter
Impedance:  8 Ω
Max. Power Input:  50 W (music Power)
Frequency Response:  25 to 21,000 Hz
Dimensions (W x H x D):  380 x 595 x 295 mm (15,2' x 23,8" x 11,8")
Weight:  14,54 kg (32 lbs) each

Akai SW-130


Akai SW-130
Specifications
Drivers:
12" woofer
3,5 tweeter
Impedance:  8 Ω
Max. Power Input:  25 W
Frequency Response:  50 to 18,000 Hz
Dimensions (W x H x D):  420 x 570 x 310 mm (16,5" x 22,5" x 12,12")
Weight:  13,1 kg (28,9 lbs) each

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)


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)


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


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