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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 2900 pre-amplifier

 

The SAE2900 Preamplifier-Equalizer presents a unique combination of sonic excellence and sophisticated system control. Carefully designed to compliment any system, the 2900 contains many attributes and features that confirm its truly exceptional value. These include the Parametric Equalizer, which ensures precise program tone control, and a multiple tape monitor/ copy/EQ system, which offers maximum useability of all tape facilities. Even though the 2900 has this comprehensive system of input, tape, tone, and output control, sonic excellence is still the primary concern at SAE. Our new ultra low distortion phono and line circuits have been carefully developed to provide the clarity and definition that establish the 2900 as still another of SAE's Components for the Connoisseur.

 

Features:

Phono Circuit

The most critical single component of any preamplifier is the phono section. Our multi-stage design ensures that all active devices will operate well within their design parameters. This careful attention to linear area operation minimizes any distortion or slewing problems. Further, active devices for this stage are hand selected for optimum performance. The result of these efforts? A circuit that delivers optimum performance from any of the fine phono cartridges available.

Parametric Equalizer

This unique tone control system is the result of years of extensive research into the purpose and uses of tone networks. With the parametric you now have the flexibility to precisely contour the tone network to create any desired effect. Every effect, from conventional wide-band bass and treble, to continuously variable notch filters, or virtually anything in between, is at your fingertips. This system, considered the standard of the recording industry , is now available to you in the 2900

Taping Facilities

Tape circuits and their uses have received careful scrutiny during the 2900's development. The end product of this scrutiny includes provisions for 3 tape machines or other devices and the ability to monitor any of these circuits. Now you can copy from any tape circuit to another tape circuit, and while copying you can monitor either machine or another source. Besides these capabilities, the following features are provided to further extend the 2900's tape capabilities.

Tape EQ.

Now you can create your own special effects, or overcome program problems. With the Tape EQ feature, our unique Parametric tone circuit can be switched between the source you wish to record, and your tape machine. Creation of background music or car stereo tapes is a simple matter with the 2900.

Filters

The 2900 provides two low frequency filters for optimum bass control. The first is at 30 Hz, designed to remove rumble and other subsonic phenomena that may compromise musical quality. The second filter operates at 100 Hz, to correct low bass accentuated by room characteristics, speaker placement and program material. To increase their effectiveness these filters are combined in the EQ group. This allows them to be switched to before or after the tape circuits along  with the Parametric. Being able to switch the filters ahead of the tape circuits ensures that rumble and other subsonic problems that may distort the recordings you wish to make will now  be removed.

 


Specifications

Total Harmonic Distortion (at any level to rated output from 20 Hz to 20 kHz):  less than 0,01%

Intermodulation Distortion (at any level to rated output with any two mixed frequencies between 20 Hz and 20 kHz at a 4/1 voltage ratio):  less than 0,01%

Rated Output:  2,5 Volts RMS

Phono

Frequency Response (RIAA Equalized):  20 Hz to 20 kHz ±0,25 dB

Signal-to-Noise Ratio (20 Hz to 20 kHz. Ref. 10 mV input at 1 kHz):  greater than 75 dB

Input Overload (at 1 kHz):  greater than 150 mV

Gain:  35 dB (to tape out); 60 dB (to pre out)

Line

Frequency Response:  20 Hz to 20 kHz ±0,25 dB

Sn (20 Hz to 20 kHz. Ref. 2,5 V RMS out)"  greater than 95 dB

Maximum Output (10 k Ω  load):  9 Volts RMS

Minimum Load:  600 Ω 

Gain:  25 dB

Power Requirements:  110 - 125 V AC, 50 -60 Hz

Power Consumption:  25 watts

Dimensions (W x H x D): 

Front Panel (W x H): 483 x 133 mm (19" x 5,25")

Chassis (D):  89,9 mm (3,5 ") excluding knobs and connectors

Weight:  4,08 kg (9 lbs)

 

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