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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





Audio Technica AT30E cartridge


AT30E Stereo Phono Cartridge with Vector-Aligned Dual Moving MicroCoils and user-replaceable Stylus.
A top-quality moving coil cartridge exhibits remarkable sonic clarity and transparency. This performance can be attributed to the very low mass, and low inductance of the tiny coils used to sense the stylus motion. But until now, moving coil cartridge popularity has been limited by three major problems which seemed almost inherent to moving coil designs.
1)It seemed impossible to make a user-replaceable stylus assembly without compromising performance.
2)Most moving coil cartridges exhibited relatively low tracking ability due to rather stiff cantilever mounting system.
3)Outputof the cartridge was below the level needed for commonly available amplifier inputs.
Introducing the new Audio technica AT30E and the end to all three problems. Our design approach is simple and direct. Rather than localethe coils in the cartridge body, they are integral with the stylus assembly. If the stylus becomes worn or damaged, the entire moving system, coils and all, is simply unplugged and replaced, just like a moving magnet cartridge. Large, gold-plated connectors insure loss-free connections so vital at the low voltages generated by a good moving coil cartridge. The result is easy field replacement with no penalty in terms of performance.

Careful research indicated that good tracking and moving coil design were indeed compatible. By controlling, effective mass and utilizing a radial damping system similar to our famed Dual Magnet cartridge, we have achieved excellent tracking ability throught the audio range. Compliance is individually controlled during manufacture of each assembly to optimize performance. This extra step, impossible with most other designs, coupled with our unique radial damping ring, insures excellent tracking of the high-energy modulation found in many of the top-quality recording now available.
Each coil is located in the ideal geometric relationship to reproduce "its" side of the record groove. This Vector_Aligned design assures excellent stereo separation, minimum moving mass, and the highest possible efficiency. It's design concept which is exclusive to Audio-Technica, and is a major contributor to the outstanding performance of the AT30E.
The AT30E output is similar to many other fine moving coil cartridges. But an increasing number of amplifiers and receivers are featuring built-in "pre-preamplifiers" or "head amplifier" to accommodate moving coil cartridges directly. Thus the new systems buyer can make a cartridge choice based on sonic characteristics rather than on input compatibility. In addition, Audio-Technica offers the Model AT630 Transformer for matching to conventional amplifier inputs.
The new Audio-Technica AT30E Dual Moving Micro-Coil Stereo Phono Cartridge.

Specifications
Generating Element:  Dual Moving MicroCoil
Frequency Response:  15 - 25,000 Hz
Output:  0,28 mV ( at 5 cm/sec)
Channel Separation:  25/15 dB (1 kHz/10 kHz)
Channel Balance:  0,75 dB
Stylus Shape:  3 x 7 ellipticall
Stylus Construction:  Nude
Tracking Force:  1,4 - 2,0 grams
Vertical Tracking Angle:  20° (IEC/DIN standard)
Recommended Load Impedance:  20 Ω
Terminals:  ,050" diameter
Mouting:  1/2" centers
Dimensions:  5/8" x 1-9/64" x 11/16"
Weight:  5,0 grams
Replacement Stylus:  ATN30E

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