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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





SAE 5000 noise reduction system


Impulse Noise Reduction System
Ever since the invention of the recorded disc, annoying "clicks" and "pops" caused by scratches, static, and other imperfections, have consistently disturbed the listening pleasure of mysic lovers. Now, SAE introduces the unique model 5000, an Impulse Noise Reduction System which eliminates those unwanted sounds with no adverse effect on the quality of the recorded material.
This break-through in electronic circuitry is so demonstrably effective, that the SAE 5000 is destined to beacome an essential part of any sound system.
The SAE 5000 is compact and sleek, built to SAE's exacting standards, and ready to enhance the performance of any system, from the standard receiver/turntable combination to the most sophisticated audiophile components.
Before the technological break trough achieved by the 5000, there were many records that offered less than ultimate performance and some which were rendered virtually unlistenable due to the presence of impulse noise. Impulse noise is generated by static discharge, record blemishes or accumilation of dirt, and is often referred to as "clicks"  and "pops". Now, with the 5000, most of these problems can be overcome. Many virtually lost recordings can be played again with their fidelity unnamed by impulse noise. Ofcourse, unblemished recordings can be played without being adversely affected by the 5000. only sounds which are detected as impulse noise are eradicated. All else remains. Old recordings, even 78 rpm's may be rejuvenated by our new system.
The circuitry in the SAE 5000 is the result of extensive research and evaluation by its inventor, Jack Sacks, into the field of impulse noise.
At the start of research a careful statistical analysis was made of impulse noise and those properties which are unique to it. From this information a logic circuit was developed for the 5000 which constantly monitors the music, searching for those unique parameters which  indicate the presence of impulse noise. Upon detection of the presence and duration of the offending impulse, which is accomplished by examining the shape of the "spike", and other parameters, the noise removal circuit comes into play which deletes pnly the damaged segment from the sound sequence. Because the duration of this impulse noise is usually so minute, (less than one thousandth of a second), it is possible to extrapolate forward a tiny segment from the music information immediately preceding the gap and thus maintain total continuity and integrity at the same time. This technique is undetectable to the ear and does not adversely affect the frequency response, dynamic range, or spectral balance of the music. The system remains passive and "transparent" at all times, doing its job only when called upon by the detection of unwanted noise.

The SAE 5000 has simple and effective controls. The principal control is a threshold adjustment which varies the sensitvity of the detection circuit. Different record characteristics may require some sensitivity adjustment.
There is a system defeat button which allows the Impulse Noise Reduction (INR) circuit to be bypassed electrically. A tape monitor switch and rear mounted jacks reconnect the tape monitor circuitry used to hook up the 5000.
Finally, the incredible effectiveness of the INR system can be demonstrated by activating the Invert switch. This action reverses the active circuitry and you  are now able to hear Only the noise your system eliminates while in the operating model.

Specifications:
Total Harmonic Distortion (at any level to rated output from  20 Hz to 20 kHz):  less than 0.1%  Intermodulation Distortion (at any level or rated output with  any 2 mixed frequencies between  20 Hz to 20 kHz at 4/1 Voltage Ratio):  less than 0.1%
Signal-to-Noise Ratio:  greater than 90 dB (below rated output)
Rated Output:  2.50 Volts RMS
Frequency Response:  ±1 dB (20 Hz to 20kHz)
Output at Clipping:  greater than 9 Volts into 10 K Ω  
Input Impedance:  75 K
Ω 
Output Source Impedance:  500 Ω 
Output Lead Impedance:  600 Ω  (minimum)
Insertion Loss:  less than 1 dB
Power Supply / Consumption:  110-125 VAC, 50 Hz to 60 Hz / 7 watts
Dimensions (W x H x D):  10.75" x 3"  x  9.25"
Shipping Weight:  8 Ibs.
Rack Mount Kit available

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