Micro Seiki MA-707 Tonearm

Here we have a classic tonearm from Japanese engineering company Micro Seiki. The company first started producing mid to high end turntables in the nineteen seventies but was primarily an original equipment manufacturer for many other manufacturers, including Luxman, Denon, Sharp, Toshiba, Hitachi, Sanyo, Sansui and Kenwood. Our example of the MA-707 tonearm is in generally good fully working condition, coming in original albeit rather tired packaging along with interconnect, screwdriver, spanner, fluid and our classic three month warranty. Please note there is no headshell supplied with this tonearm.
Micro Seiki Said….
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.
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.
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. Tracing is extremely sensitive at low stylus forces, as with high-compliance type cartridges.
Specifications
Type: dynamic balance tonearm
Overall Length: 315mm
Effective Length: 237mm
Overhang: 15mm
Offset Angle: 21°50’
Tracking Angle Error: > 1.5°
Height Range: 43-83mm
Cartridge Weight Range: 4-12g
Lateral Motion Sensitivity: 10mg
Vertical Motion Sensitivity: 15mg
Anti-Skating Device: Spring tension type
Tonearm Lifter: Delayed action type
Headshell Weight: 4g
Headshell Connector: Semi-integrated type with hard gold plating