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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





Micro Seiki MA-707


Low mass type dynamic balance tonearm.
The MA-707 is a newly developed dynamic balance tonearm featuring superb tracking due to the light stylus force. And the low effective mass perfectly matches the characteristics of high-compliance type cartridges. Another feature is the rigid yet light aluminium alloy used in the pipe part of the arm. The internal lead wires are actually tiny coaxial cables. Hard gold plating of the headshell terminals and plug-in type construction assure perfect conductivity. The unique dynamic balance system has been made practical due to the spring system (patent pending) using a torsion bar. Linearity is outstanding even with extremely light stylus force.
Even with low-compliance type cartridges, the correct balance can be obtained by adding weights to compensate.

A complete solution to the problems of the dynamic balance system.
There are few dynamic balance type tonearms in the market even though this type is said to be ideal. One reason is the precision required for the spring built into the dynamic balance system. The weak points are the difficulty of maintaining spring linearity at light stylus forces and loss of tension with the passage of time. The MA-707 uses a precision spring developed through strict selection of materials and high precision processing. These problems have been completely solved by the use of a torsion bar. Stylus force change is extremely linear from 0,3 to 3,0 grams, by 0,1 gram step. Tracking is extremely sensitive at low stylus forces, with high compliance type cartridges.

A dynamic balance system without inertial moment
The tonearm itself is perfectly balanced and stylus force is applied only through the tension of the spring. Because of this, there is no moment acting upward due to unevenness of the record surface as with the static balance type. In other words, whatever the condition of the record surface, the stylus force is constant. And there is almost no influence from the warp of record and eccentricity the turntable being out of level, etc.

Specifications:
Type:  Dynamic balance
Effective Length:  237 mm (9-3/8")
Overhang:  15 mm (19/32")
Maximum Tracking Error:  less than 1,5°
Usable Cartridge Weight:  4 - 12 g (0,14 - 0, 42 oz)
Range of Tracking Force Adjustment:  0 - 3 g

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