The movement of
the arm with respect to the disc can be radial, as occurs in the majority of
the turntables the needle describes an arc of girth) or it can also be linear
(the needle describes a radius of the disc). This last system is taking
strength in the market, although its prices are quite superior to conventional.
Radial or
conventional movement arm.
It is the most
extended system and the arm is equipped with a movement around a vertical axis
and a horizontal that allows it to follow the furrows. The force necessary to
move it comes out the furrows of the disc that are like guides for the needle. Therefore
the great care with which the tone-arm should be designed for a smooth
operation throughout the all path and to demand in this way the binomial
needle-furrow as little effort as possible.
Linear or
tangential motion arm.
The improvement
of the servo-assisted movements and the photoelectric position detectors has
made it possible to make this type of turntable in which the arm is mounted on
a trolley that slides on rails, driven by a controlled engine. Another
advantage of this system is that the arm can be shorter and, consequently,
lighter and does not need lateral thrust compensatory force.
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