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