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 CDC-320

 Enjoy the convenience of multidisc Cd playback, with the Marantz CDC-320 CD charger. The CDC-320 employs a 6 disc magazine to provide more than 6 hours of uninterrupted music. All 6 disc can  beprogrammed in random order. Extra magazines are available so you can load your entire CD collection into magazines for ready playback.
The extraordinary convenience of multidisc playback is enhanced by the CDc-320's many operational features. The motorized front loading drawer handles your precious discs with delicate care.
The laser pickup employs 3 beam technology for optimum tracking of the optical signal. Full 16-bit linear digital to analog conversion is utilized to maximize the signal to noise ratio and to minimize distortion. State-of-the-art. Double error correction assures the purest digital sound reproduction.
 The CDC-320's many additional features allow you to repeat play one disc, or the entire 6 disc magazine. Forward and revers skip and search enable you to quickly locate any desired musical passage. A digital elapsed time display keeps you informed of playback status. Wireless remote control puts you in control from across the room.

The beautifully styled front panel will make the CDC-320 an attractive centerpiece in any home entertainment system. The carefully human engineered control will make the CDC-320 a pleasure to use for the entire family. And, legendary Marantz reliability will keep the CDC-320 providing musical enjoyment for years to come.

Features
Wireless Remote Control
6 Disc Magazine
15 Track Programmable
3 Beam Laser

Dimensions (W x H x D):  16 ½" x 4" x 13"

Weight:  11 lbs

Technics SV-P100

 For home and studio digital recording appilcations Technics presents the SV-P100 , a wholly self-contained unit with built-in VHS tape mechanism. The Technics SV-P100  is the most compact digital recording system in existence. lt has everything you need to start making the highest quality recordings you've  ever heard. Advanced semiconductor circuitry provides  outstanding performance in a compact package. Plus you enjoy versatile digital  editing features. W ith all this state-of-the-art technology, you'll  be happy  to find that the SV-P100 is just as easy to use as an ordinary cassette deck-perhaps easier.
 High-Density LSls for Compact Size
State-of-the-art semic onductor technology is the  key to the compact dimensions of the SV-P100, the world's smallest digital recording system. Three original  LSI c hips handle virtually  all  of the signal  processing including digital-to-analog and analog-to-digital conversion. They also take care of error detection,  error correction, video signal modulation and time-base correction. Since these take the place of thousands of transistors and hundreds of  lCs, circuit size is dramatically reduced.

Built-in VHS Mechanism
Built into the SV-P100 is a very high quality VHS video tape transport mechanism with advanced video heads and quartz locked direct drive motors. Basic operation is just like on a conventional cassette deck, with the comfort of microcomputer feather-touch control keys. You simply put a cassette into the front loading compartment and press the rec and play buttons together to begin recording. The cassette door is motor driven for smooth, silent operation when you want to load or eject a cassette.
Multi-FunctioN Display
There's adigital LCD tape counter display, bright FL recording/playback level display, and indication for all functions that you might need. The FL  level display uses fluorescent display tubes to provide very accurate indication of recording level. Besides instantaneous peak indication, it also has  peak-hold which shows  you the highest signal peaks reached in each 2 -second period. T his makes it much easier to set optimum recording level. Another valuable feature is the playback data check indication which gives you a readout of playback signal quality
 Versatile Editing
Since the digital signal is recorded on the tape's video tracks, the space usually used for audio is left free. The SV-P100 uses these extra tracks for "jump" and" search" marks.  This gives you a kind of electronic editing ability that is not possible in ordinary cassette decks. Record a jump mark along a specific section of the tape and the deck will automatically bypass that section at 8 times normal speed.  Normal playback resumes after the end of the  jump mark. This is useful when you want to skip over undesired portions of a recording. Search marks let you rapidly locate specific points on the tape. The tape will advanced to the nearest search mark at 8 times normal speed and then stop. lf you press the play key with the search key, then playback will begin when the search mark is reached.
You can record as many search and jump marks as you want, using the convenient editing levers. Since these marks remain on the tape, you can take advantage of this convenience every time you listen to a recording. Of course you can also selectively erase search and jump marks (by pressing the "clear" lever) as required.
In addition to all this,you have the "locate" function which serves as a memory linked to the tape counter. But unlike on conventional cassette decks,  you don't have to set the counter to zero. This memory stores the actual tape counter number at the instant you press the locate button. The tape will then stop (or begin play)att he memorized position. You can also check the locate memory position by pressing the recall button.
 Other Features
Large fader knob for smooth fade-in and fade-out effects.
Digital input and  output terminals for making digital tape copies usinga nother SV-P100.
Angled control panel with status indicator LEDs.
Headphone and microphone jacks on front panel.
High quality microphone amp built-in for superior live recording quality.
Recessed power switch helps avoid accidental on/off switching.
Automatic recording possible with audio timer.
Dew (condensation) display and protection circuitry
Tracking adjustment for optimum playback of tapes recorded on other equipment.

Specifications
Type:  Digital audio cassette recorder
PCM Standard:  By technical File -- STC-007
Quantization:  Linear 14-bit
Decoding:  Linear 14-bit
Tape: VHS type video cassette
Signal Format:  Standard NTSC television; signal by VHS standard
Recording Time:  About 2-hour max.  (Using NV-E180)
Channels:  2 (L, R)
Frequency Response:  2 Hz  - 20 kHz (±0,5 dB)
Harmonic Distortion:  less than 0,01% (1 kHz, 0 dB)
Dynamic Range:  More than 86 dB
Input Sensitivity/Impedance: 
Line :  30 mV (-15 dB) / 50 kΩ
Microphone :  0,7 mV (-15 dB) / 600 Ω
Digital :  1 Vp-p / 75 Ω (Video format)
Output Level/Impedance
Line :  400 mV (-15 dB) / 600 Ω
Digital :  1 Vp-p / 75 Ω (Video Format)
Remote Control Terminal:  8 pin DIN terminal
Edit Function: 
Jump, Search,
Memory, Memory recall, Playback data  check,
Tracking adjustment,
Timer recording & 1-hour delay recording;
Digital recording terminals,
Headphone and microphone jacks
General
Power Supply:  AC 110/120/220/240 V, 50/60 Hz
Power Consumption:  90 W
Dimensions (W x H x D):  430 x 278 x 346 mm

Weight:  21 kg

Technics SV-100

 SV-100 Digital Audio processor, designed for use with a VCR, provides very high quality digital audio processing for digital audio recording and playback.  Not only is the SV-100 compact, it weighs only 2,9 kg (net) making it the world's lightest digital audio processor.
This means that the SV-100 is ideally suited for portable use, especially when combined with the matching Panasonic NV-100 VCR.  Its attractive styling also complements other high quality audio components when used in a home hi-fi system.
 Advanced Semiconductor Circuitry for Compact Size
Sophisticated original LSI and microprocessor technology contributes to this processor's surprisingly compact size and light weight. The PCM signal processing LSI (MN6601) contains about 10,000 elements in a 6,08 x 5,58 mm chip; the playback LSI (MN6602) has about 15,000 elements in a 6,46 x 6,18 mm chip; the recording/playback control LSI has about 6,000 elements in 4,48 x 3,62 mm chip.
Together, these tree LSIs are equivalent to about 320 logic Ics. Instead of the conventional separate A/D and D/A converters, a single AD/DA converter is used for conversion from analog to digital and vice versa.  This revolutionary circuitry also means more dependable performance.
 Designed for Quick Precise Control
For quick and accurate adjustment, the SV-100 has a master level control and a stereo balance control. This unusual system is actually the most practical for most purposes such as recording FM broadcasts or Compact Discs. In both cases it is easiest to adjust same time and no stereo balance adjustment is usually needed. The same goes for live recording where the left and right  channel microphones are normally matched. Furthermore, the less used controls are of the slide switch type, so there is little danger of accidental misoperation.

2-Color FL meters for Accurate Indication
In digital as in analog recording, accurate meters are essential for correct recording level setting. However, with digital audio, it is all the more important not to set recording level  too high. Therefore, the SV-100 is equipped with precision FL meters that extend all the way from -50 dB to +6 dB. Since clipping occours above 0 dB, this wide-range metering system lets you see exactly where you should set recording level to avoid distortion. Comparate this with other digital audio processors that give only an "over" indication if recording level is too high.
 Versatile Connection Facilities
The SV-100 has two complete sets of video input/output jacks, one set on the side and one on the rear panel. This lets you use the Sv-100 in a vertical or horizontal position. The matching Panasonic NV-100 VCR has similar connection facilities so that the two are ideally suited for portable use. Of course, the SV-100 can be used with virtually any home VCR (or ¾-inch U-matic type VCR).

Suplied AC power Unit with Handy Video/Audio Switch
TheS V-100i s ready to use right away since it comes with its own AC power unit for home use. This compact  unit is designed to simplify connections while supplying power to the SV-100. It also works as a battery charger for the optional battery packs available for  the SV-100 On the AC power unit's front panel is a "recording" switch that lets you use your VCR for recording TV programs or for PCM digital recording without having to change any connections
 VCR Tracking Check and Battery Check Functions
A front panel slide switch lets you change the display from recording/playback level indication to VCR tracking and battery check indication. The VCR tracking readout tells you how well the video tape recorder's heads are tracking the recorded tracks during playback. You can then adjust the VCR to obtain optimum playback quality. This is particularly important if the tape is being played back on a different VCR from that used for recording. The battery check readout tells you how full the battery is and whether it needs charging.
Other Valuable Features
Built-in high quality mic amp.
Digital copy  output jack.
Mute cancel switch lets you hear sound in VCR's cue and review modes.
Headphone volume control.
Playback mode switch for optimum matching with VCR signal characteristics.
Rec mute switch
Specifications
Type:  Digital audio processor
PCM Standard:  FILE -- STC-008
Quantization:  Linear 14-bit
Decoding:  Linear 14-bit
Recording Time:  Max. 3 hours (when using the NV-E180 video cassette tape)
Channels:  2 (L, R)
Frequency Response:  2Hz - 20kHz (± 0.5 dB)
Harmonic  Distortion:  Less than 0,01% (1 kHz, 0 dB)
Dynamic Range:  More than 86 dB
Input Sensitivity/Impedance: 
Line :  30 mV (-15 dB) / 50 k Ω
Microphone :  0,7 mV (-15 dB) / 600 Ω
Video :  1 Vp-p / 75 Ω (Video format)
Output Level/Impedance: 
Line :  400 mV (-15 dB) / 600 Ω
Video :  1 Vp-p / 75 Ω (Video format)
Digital Copy :  1 Vp-p / 75 Ω
ACCESSORY FUNCTIONS
VCR tracking check, Battery check,
VCR playback mode switch (to match VCR characteristics) auto/off  playback muting  switch, Rec mute  switch, Playback (recording) mode indicator, Headphone volume control, Supplied AC power unit has battery charging and video/digital audio switching functions.
General
Power Supply: 
AC/DC/Car battery (DC 12V 1,6A using optional battery pack);
Exclusive AC power unit supplied (AC 110/120/220/240 V, 50/60 Hz)
Dimensions (W x H x D): 
Main Unit :  238 x 92 x 240 mm
Power Unit :  78 x 92 x 240 mm
Weight (approx):
Main Unit :  2,9 kg

Power Unit :  2,3 kg

Technics SL-P10


 Pure music reproduction. With no audible noise or distortion. We call it the essence of nothingness. After a decade-long commitment to digital audio technology, Technics offers you one different Compact Disc player that capture this essence.

Like a live performance
Each CD player uses our unique semiconductor laser to read the billions of bits of information encoded on the Compact Disc as it is spun with incredible accuracy by our quartz-locked, direct drive motor. Powerful new Ics, LSIs and a microprocessor-controlled D/A (digtal-to-analog) conventer, all original designs by technics, process the information into music - so realistic and dynamic as to be virtually indidtinguishable from a live performance.
 A choice of CD players
Our original and still state-of-the-art. CD player, the SL-P10, offers the unequaled versatility of 63-step random acces programming for precise play of any part of the disc, in any sequence, and features the convenience of remote control, headphone jack, and Auto-Music-Scan.

We make the discs  too
A superior CD player can only be built upon a complete understanding of the Cd itself. So, we make the discs too. Only Technics produces both Cd players and CDs under one roof.
Technics - We put pure music within the reach of everyone.
Features and Functions
Intro-skip plays first few seconds of each song, so you can easily check disc contents
Repeat function for entire disc or program contents
Pickup position indicator in disc holder section (as well as in FL display)
Control key indicators
Handsome design to match other Technics high quality audio components
Automatic disc loading
Variable output level audio signal
Search functions:  Manual;  Auto music search;  Intro-skip;  Program
Program capability: 
Maximum 63-step programmability;  Band cueing,
Random begin play setting (band, minute/second); 
Random end play setting (band, minute/second); 
Display (140 x 55 mm) large FL display;
Pickup position, Band beginning position, Program, Band number, Playing time
Control keys:  7 basic keys; 14 programming keys

Disc loading:  Automatic front loading
 Advanced Original LSI Circuitry
The SL-P10 features true state-of-the-art. Semiconductor circuitry with 12 new original LSIs and ICS designed specifically for compact disc reproduction. The digital signal processing circuitry uses 3 LSIs for demodulation, error correction and CIRC control. Error detection and correction are based on the exclusive "technics Super Decoding Algorithm" system. The D/A conventer is perhaps the single most important device in digital audio. It must convert the 65536-step digital signal into an accurate replica of the original analog signal. Here the SL-P10 uses a newly developed that delivers extremely high performance with no more than ±0,002% nonlinear distortion. Other Ics are used for spindle motor servo control, head amp, actuator drive, auto focus, signal processing, programmed play, laser power control, and traverse motor drive.
 Precision Mechanisms with Sophisticated Microcomputer Control
In addition to the above mentioned high density LSIs and ICs, the SL-P10 employs four microcomputers for centralized random access system control, FL display drive, digital slicer, and optical pickup position control. This sophisticated circuitry supports the precision mechanisms of disc rotation and laser pickup operation.
The pickup system includes a semiconductor laser, actuator, lens, prism and photodetector in a precision integrated aluminum body of rugged construction for the highest reliability.
The actuator (lens drive mechanism for focus and tracking) features a twin parallel damper, derived from our advanced phono cartridge technology, which enables extremly smooth and accurate focusing and tracking servo performance. A 3-beam tracking servo is employed to assure the highest operational stability.

The 12 cm wide CD rotates at a tare of 500 to 200 times per minute. Therefore the turntable drive motor must be of a different type from that used for conventional phono turntables.
One important point is that the motor must be designed to prevent shaft rolling. This is achieved by employing an ultra-compact brushless DD motor newly developed based on the long experience of Technics id direct drive technology.
In the SL-P10 CD player system, this DD motor and the turntable are mounted extremely close together to assure the required rotational stability.
The pickup, its drive mechanism, and the turntable drive mechanism must all be assembled together with the highest precision. In the SL-P10 , all of these mechanisms are manufactired by us, making possible precision integrated construction of an "optical deck" in an aluminum diecst chassis. This keeps all these precision electromechanical devices in optimum alignment to bring out their full potential and that of the system as a whole.
Specifications
Type: 2-channel Compact Disc Plaeyer
Samplig Frequency:  44,1 kHz
DA Conversion:  16-bit linear line
Frequency Characteristic:  4 Hz - 20 kHz
Dynamic Range:  better than 90 dB
Signal-to-Noise Ratio:  better than 90 dB
Total Harmonic Distortion:  less than 0,004%
Channel Separation:  better than 90 dB
Error Correcting System:  Super decoding algorithm by Technics
Wow and Flutter:  same as Quartz-crystal oscillator precision
Pickup System:  Astigmatic  3-beam
Objective Lens Suspension:  Twin parallel damper suspension
Light Source:  Semiconductor laser
Wavelength:  8000 A
Output Voltage:  A 150 mV (variable)
Power Requirement:  100, 120, 220, 240 V,  AC , 50/60 Hz
Power Consumption:  48 W
Dimensions (W x H x D):  430 x 145 x 333mm
Weight:  10 kg

Sansui 5900Z

 The Sansui "Z" Series - The Realization of Great Expectations

Music lovers expect uncommon products from Sansui. And Sansui delivers. The Sansui "Z" Series of synthesized digital receivers are designed and bulit with a loving logic that can be seen, touched and heard. Thae the Sansui 5900Z, a reasonably priced receiver with every important feature you could possibly want for the heart of your high fidlity system.
 Synthesized Digital Tuning
You can't mistune a Sansui synthesized digital receiver. Not even a little. Press the up/down tuning buttons. The digital circuitry ensures that every station received is automatically locked in for lowest possible distortion, with its frequency indicated both on a digital readout and by an LED indicator along an analog type dial.

Touch Volume Control and LED Peak Power level Indicator
The Sansui 5900Z uses a pair of touch-buttons to adjust the listening level. Relative volume control setting is indicated on a fluorescent display. Actual peak power amplifier output is shown by 14-segment LED indicators.
 12 preset Stations
To make FM and AM tuning still easier, up to 12 user-selected stations may be "stored" in the 5900Z's memory circuits for instant recall. The last station received will be remembered when the tuner is turned on again, and memories are kept "live" even during a power outage.

DC Servo Amp for Dependable Power
The leader in DC technology, Sansui uses a servo-controlled amplifier circuit in all "Z" receivers to eliminate unwanted ultra-low frequencies - like record warps - while maintaining the advantages of direct-coupled circuitry in their amplifier sections. The 5900Z delivers 75 watts/channel, min. RMS, both channels into 8 ohms, from 20 - 20,000 Hz, with no more than 0,03% THD.
And there's more. Like LED's for every important function. Two Muting Modes. Two tape deck connection with dubbing. And much more.
Specifications
Audio Section
Power Output:  75 W per channel into 8 Ω (min. RMS both channel driven, 20-20,000 Hz, with no more than 0,03% THD)
Load Impedance:  8 Ω
Total Harmonic Distortion:  less than 0,03% (at or below rated min. RMS power output)
IM Distortion (60 Hz - 7 kh = 4:1 SMPTE method):  less than 0,03% (at rated power output)
Frequency Response (at 1 watt)
Overall (from AUX):  5 to 100,000 Hz, +0 dB, -3 dB
RIAA Curve Deviation (Phono, 20 Hz - 20 kHz):  ±0,3 dB
Damping Factor (20 Hz - 20 kHz, both channels driven):  40 into 8 Ω
Input Sensitivity/Impedance (at 1 kHz):
Phono :  2,5 mV/47 k Ω (max. Input capability: 180 mV at 1 kHz, less than 0,1% THD)
Tape 1, 2 Play :  150 mV/ 47 k Ω
Aux :  150 mV/47 k Ω
Output Level (at 1 kHz)
Tape 1, 2 Rec :  150 mV into 47 k Ω
Signal-to-Noise Ratio (short circuit, A-network)
Phono :  80 dB
Aux  :  95 dB
Channel Separation (at 1 kHz)
Phono ;  50 dB
Aux :  60 dB
Controls
Bass :  ±10 dB at 50 Hz
Treble :  ±10 dB at 10 kHz
High Filter :  -3 dB at 5 kHz (6 dB/oct)
Loudness (Volume  -30 dB position): +8 dB at 50 Hz; +6 dB at 10 kHz
Audio Muting:  -20 dB
FM Section
Tuning Range:  88 to 108 MHz
Usable Sensitivity IHF [mono/stereo]:  10,8 dBf (1,9 µV)/21 dBf
50 dB Quieting Sensitivity [mono/stereo]:  15 dBf / 37 dBf
Signal-to-Noise Ratio [mono/stereo]:  76 dB / 70 dB
Distortion (at 65 dBf)
Mono
Less than 0,3% at 100 Hz
Less than 0,15% at 1, 000 Hz
Less than 0,4 % at 6,000 Hz
Stereo
Less than 0,3% at 100 Hz
Less than 0,18% at 1,000 Hz
Less than 0,4% at 6,000 Hz
Alternate Channel Selectivity (at 400 Hz):  60 dB
Capture Ratio:  1,0 dB
Image Response Ratio:  50 dB
Spurious Response Ratio:  70 dB
IF Response Ratio:  90 dB
Stereo Separation:
30 dB at 100 Hz
40 dB at 1,000 Hz
28 dB at 10,000 Hz
Frequency Response:  30 - 15,000 Hz (+0,5 dB; -1,0 dB)
Hum and Noise(at 65 dBf):  70 dB
Antenna Input Impedance [balanced/unbalanced]:  300 Ω / 75 Ω
AM Section
Tuning Range:  530 - 1,600 kHz
Usable Sensitivity (bar antenna):  53 dB/m
Selectivity (±10 kHz):  30 dB
Signal-to-Noise Ratio:  43 dB
Distortion (at 30% Modulation, 80 dB/m):  less than 0,5%
Image Response Ratio:  40 dB at 1,000 kHz
IF Response Ratio:  35 dB at 1,000 kHz
General
Power Requirements:  120, 220, 240 V; 50/60 Hz
Power Consumption:  280 watts, 350 VA (max. 350 watts)
Dimensions (W x H x D):  485 x 138 x 313 mm (19-1/8" x 5-7/16" x 12-3/8")

Weight (net):  9,5 kg (20,9 lbs)

Luxman R-1050

 Ultimate High Fidelity Stereo Component
AM/FM Stereo Receiver Luxman Model R-1050
A brand New reciver with LUX's impeccable breeding and modern styling. 
 Pre-amp Section
A rotary switch makes it possible to select FM, AM, Auxiliary, or either of two phono inputs. The equalizer stage is composed of a two stage direct coupled amp with PNP and NPN transistors, which ensures excellent linearity and adeguate phono overload protection.
Two sets each of tape input and output allow duplication from one tape recorder to the other or vice versa and instantaneous monitoring from either input. This is an extremely useful and unusual feature.
Lux's well known NF type tone controls are provided for treble and bass, and low and high cut filters are also included. A loudness switch is employed to boost both treble and bas at low volume levels.
 Power Amp Section
Direct coupled DC output amp circuitry utilizing dual rail power supply ensures the best possible bass, the smallest distortion, and very low noise.
The output stage with almost mandatiry fully complementary configuration makes it possible to suppress distortion to an almost immeasurable level of typically 0,05%.
A time delay muting circuit is provided to remove unwanted switch-on thumps and this simultaneously plays the role of speaker protector.
Very useful and equally eye-catching LED peak indicators make it possible to read the output power level instantaneously.
 FM Section
A high class 4-gang tuning capacitor in the front end offers an excellent 1,8 µV sensitivity, and good overload and spurious characteristics are realized in combination with the dual gate MOS FET.  Linear phase ceramic and block filters guarantee good band pass response. These filters are excellent in group delay time characteristics and sharp skirt selectivity, and a quadrature IC and distortion free discriminstor transformer ensures good limiting and low distortion.
For stable and excellent distortion as well as good separation and S/N ratio, a select PLL MPX IC is adopted, and also an exclusive LC low-pass filter is used to suppres carrier leakage. Moreover a constant voltage supply circuit is provided to ensure stable function of aech section.

Dolbylized FM can be received  with the insertion of an additional Dolby circuit board. Unique LED peak Indicators permit instantaneous reading of peak power output.
 AM Section
For high grade reception of AM broadcasting as well, meticulous care is paid utilizing modern technology, which can be seen in strong AGC, a ceramic filter of good selectivity and a low distortion detector.
Specifications
Audio Section
Power Output:  55 watts per channel (both channel driven  into 8 Ω, 20-20,000 Hz, with no more than 0,05% THD)
Rated I.M.:  no more than 0,05% (8 Ω, both channel driven, 60 Hz : 7 kHz = 4 :1)
Frequency Response:  10 Hz - 50 kHz (-1 dB)
Input Sensitivity: 
Phono :  2,5 mV
Aux, Monitor :  150 mV
Phono Overload Voltage:  150 mV (1 kHz)
Signal-to-Noise ratio:
Phono :  66 dB
Aux, Monitor :  86 dB
Residual Noise:  no more than 0,7 mV
Damping Factor:  no less than 60 (8 Ω)
Tone Control:
Bass :  ±10 dB at 100 Hz
Treble :  ±10 dB at 10 kHz
Filters:
High Cut :  7 kHz (6 dB/oct.)
Low Cut :  70 Hz (6 dB/oct.)
Crosstalk at 1 kHz:  -65 dB (Aux, Monitor)
Peak Indicators:  0, -6, -9, -12, -15, -18 dB
FM Section (IEEE/IHF Standard)
Usable Sensitivity [Mono/Strereo]:  10,3 dBf (1,8 µV) / 18,2 dBf (4,6 µV)
46 dB Quieting Sensitivity [Mono/Strereo] 50 µS:  14,1 dBf (2,8 µV) / 37,4 dBf (40 µV)
50 dB Quieting Sensitivity [Mono/Strereo] 50 µS:  14,1 dBf (2,8 µV) / 36,8 dBf (38 µV)
Signal-to-Noise Ration at 65 dBf[Mono/Strereo]:  74 dB / 70 dB
Muting Threshold [Mono/Strereo]:  8,8 dBf (1,5 µV) / 8,8 dBf (1,5 µV)
Frequency Response 30 Hz to 15 kHz:  +0,5 dB; -1,5 dB
Distortion at 65 dBf [Mono/Strereo]:
100 Hz :  0,1% / 0,2%
1 kHz :  0,1% / 0,2%
6 kHz :  0.3% / 0,4%
Intermodulation Distortion [Mono/Strereo]:  0,1% / 0,2%
Capture Ratio at 65 dBf [mono]:  1,3 dB
Alternate Channel Selectivity [mono]:  70 dB
Spurious Response Ratio [mono]:  90 dB
Image Response Ratio [mono]:  80 dB
IF Response Ratio[mono]:  85 dB
AM Suppression Ratio [mono]:  52 dB
Stereo Separation:
100 Hz :  45 dB
1 kHz :  45 dB
10 kHz :  40 dB
Subcarrier Product Ratio [stereo]:  60 dB
SCA Rejection Ratio [stsreo]:  60 dB
AM Section
Usable Sensitivity at 1 MHz, 400 Hz, 30% mod.:  15 µV (ext. Ant.)
Signal-to-Noise Ratio at 1 MHz, 10 mV, 400 Hz, 30% mod.:  52 dB
Distortion at 1 MHz, 10 mV, 400 Hz, 30% mod.:  0,5%
Image response Ratio at 1 MHz:  75 dB
IF Response Ratio at 1 MHz:  80 dB
General
Power Consumption:  270 W (at full Power, 8 Ω) 120 V 2,5 A (CSArated)
Dimensions (W x H x D):  490 x 180 x 355 mm (19-5/16" x 7-3/32" x 14")

Weight (net):  13,5 kg (29,7 lbs)

Philips EL-7040

This 30 W loudspeaker gives uniform, undistorted sound reproduction over a frequency range of 35 to 10,000 c/s. excellent bass reproduction is obtained owing to the very flexible suspension and centring of the cone. As the air gap is longer than the moving coil, the latter always vibrates in a homogeneous field, thereby excluding sound distortion, even at lerge amplitudes of the cone.

The core of the magnetic system is lined with brass; the eddy currents generated in this brass lining damp the natural resonances of the cone and improve the transient reproduction. Moreover, owing to the brass lining, the impedance in the high-frequency range increases less than with other loudspeakers.
The heavy magnet of Ticonal steel will not be misaligned, even if subjected to violent shocks.
The frame is of die-cast aluminium.
All parts are cadmium-plated or impregnated to avoid corrosion.

Specifications
Frequency Range:  35 - 10,000 Hz
Power:  30 watts
Dimensions:  12" cone diameter
The loudspeaker is available in two versions:
Type EL 7040/00 :  with matching transformer for 100, 70 and 50 V, impedance 335, 165 and 85 ohms (respectively)

Type EL 7040/01 :  without transformer, impedance 5 ohms.

Akai AM-2250



Specifications
Power Amplifier Section
Rated Output Power  (2-channels driven): 
28 watts per channel at 4 Ω (minimum RMS)  from 20 to 20,000 Hz with no more than 0,3% (THD)
25 watts per channel at 8 Ω (minimum RMS)  from 20 to 20,000 Hz with no more than 0,2% (THD)
2 x 30 watts into 4 Ω at 1 kHz, with no more than 0,3% THD
2 x 30 watts into 8 Ω at 1 kHz, with no more than 0,2% THD
Power Bandwidth (IHF):  10 Hz to 40 kHz/8 Ω  (Total Harmonic Distortion: 0.2%)
Signal-to-Noise Ratio (IHF) ;
Phono:  Better than 75 dB
Aux:  Better than 95 dB
Residual Noise:  Less than 0.7 mV at 8 Ω
Channel Ssparation (lHF) Phono:  Better than 45 dB at 1,000 Hz
Damping Factor:  More than 50 (1 kHz, 8 Ω)
Output Speakers:  A, B (4 to 16 Ω)/A + B (8 to 16 ohms)
Output Headphone:  4 to 16 Ω

Preamplifier Section
Input Sensitivity/Impedance;
Phono:  3 mV/47 k Ω
Aux:  150 mV/l00 k Ω
Tuner:  150 mV/100 k Ω 
Tape  Monitor (PIN/DIN): 150 mV at 100 k Ω /  30 mV at 80 k Ω
Tape Rec Output Level/Impedance (PIN/DIN):  150 mV at 100 k Ω / 30 mV at 80 k Ω
Frequency Response
Phono (RIAA Standard):  30 Hz to 15 kHz  +1 dB, -1 dB
Tuner, Aux, Tape Monitor:  10 Hz to  40 kHz  +0 dB, -1 dB
Tone Control;
Bass:  ±8 dB at 100 Hz
Treble:  ±6 dB at 10 kHz
Loudness Control:  +9 dB at 100 Hz, +4 dB at 10 kHz (Volume control set at -30 dB position)

Miscellaneous
Semiconductors:  Transistors - 3,  Diodes - 4,  IC's - 2 
Power Requirements:  110/220/240V , 50/60 Hz
Dimensions (W x H x D):  380 x 130 x 220 mm,  (15 x  5,1 x 8,7 inches)

Weight:  6.2 kg,  (13.6 lbs)

Akai AT-2250



Specifications
FM TUNER SECTION
Frequency Range:  87,5 MHz to 108 MHz
Sensitivity (IHF):  1,9 μV
Capture Ratio:  1,3 dB
Selectivity (IHF):  More than 65 dB
Image Rejection:  More than 60 dB (98 MHz)
IF Rejection:  More than 85 dB (98 MHz)
Spurious Rejection:  More than 85 dB (98MHz)
AM Suppression:  60 dB
Signal-to- Noise Ratio:  70 dB
Harmonic Distortion:
Mono:  Less than 0,1% (100% modulation)
Stereo:  Less than 0,2% (100% modulation)
Stereo Separation:  More than 42 dB (1 kHz)
Sub Carrier Suppression:  More than 40 dB
Output Voltage:  500 mV (100% modulation)
Antenna Input Impedance:  300 ohms balanced, 75 ohms unbalanced

AM TUNER SECTION
Frequency Range:  520 kHz to 1,605 kHz
Sensitivity (IHF):  100 μV/m (bar antenna), 17 μV (external antenna)
Selectivity (IHF):  More than 30 dB
Image Rejection:  More than 50 dB (1 MHz)
IF Rejection:  More than 40 dB
Signal to Noise Ratio:  More than 55 dB
Output Voltage:  500 mV (30% modulation)
Antenna:  Built-in ferrite bar antenna

MISCELLANEOUS
Semi-Conductors:  Transistors: 6;  Diodes: 7;  FETs: 1;  ICs: 3
Power Requirements:  110-120/220/240 V, 50 -60 Hz Switchable
Dimensions (W x H x D):  380 x 130 x 220 mm;  (15 x 516 x 8,7 inches) 

Weight:  4,7 kg (10,3 lbs)

SAE Mark IX

 SAE Mark Nine Preamplifier Equalizer
The SAE Mark IX offers the features and flexibility of an equalizer and a preamplifier control center. Professional-type slide pots and push-buttons are utilized instead of the conventional rotary-type controls. The Mark Nine's operational characteristics are much like those used in recording studios. The equalizers may be used to compensate for porly equalized records, modify the tonal characteristics of loudspeakers, and in some instances be used to compensate for room characteristics.
 Unique Features
Professional-type equalizer utilizing five frequencies instead of conventional tone controls.
Ten torroidal LC bandpass filters with 12 dB/octave slopes.
Specially designed slide controls assure the industry's most accurate tracking. Equalizer and balance controls feature a center detent position.
Exclusive tape-copy facility.
Program and mode selections are made with push-buttons.
Equalizers have dual range: variable to ±16 dB or ±8 dB.
An equalizer defeat switch to electrically remove the equalizers from the circuit.
Specifiactions
Equalizer Control Range:  ±16 dB or ±8 dB at 80 Hz, 320 Hz, 1280 Hz, 5 kHz and 15 kHz
Frequancy Response:
High Level Inputs :  10 Hz to 100 kHz  ±0,25 dB
Low Level Inputs :  20 Hz to 20 kHz  ±1 dB
Harmonic Distortion RMS:  Guaranteed less than 0,02% for any audio frequency (20Hz -20kHz) at rated output (2,5 volts output)
Typical performance .01% at the residual level of our test equipment (Generator: Hewlett Packard H-20-200CD; Distortion Analyzer: Hewlett Packard 333A)
Intermodulation Distortion (60 Hz and 7 kHz 4/1 - 60 Hz and 12 kHz 4/1 - 60 Hz and 2 kHz 4/1):
Guaranteed less than 0,02% at arated output.
Typical performance .01% at the residual level of our test equipment (IM Analyzer used is Audio Instrument Co. No. 168A)
Signal-to-Noise Level:
High Level :  90 dB below rated output
Low Level :  75 dB below a 10 mV input
Gain: 
Phono :  62 dB at 1000 Hz
High Level :  20 dB
Maximum Outptut:  18 volts into high impedance
Impedances:
Phono :  47 k Ω
High Level :  100 k Ω
Output :  600 Ω
Dimensions (W x D x H):  17" x 7" x 7-3/4"

Weight (Shipping):  15 lbs