The arm should be
both rigid and light so it must be necessary to carefully choose the materials
and shape to meet this condition. The shape that gives greater rigidity with
the minimum section of material is the tube shape. Lately there are versions of
carbon fiber arms in the form of a tube that allow them to lighten them even
more. The arm must be balanced with respect to its horizontal and vertical
axis. When it is in equilibrium, its center of gravity must be at the point
where the two axes are crossed. In order to achieve this with respect to the
horizontal axis it is necessary to equip it with a counterweight on its back
that serves at the same time as a scale in order to obtain the weight necessary
for the phono magnetic cartridge.
At this point we
must indicate what concerns the shape of the arm, on which has been provoked a
polemic between two tendencies: the straight arm and the arm in the form of S.
In the straight
arm, the spindle incorporates the angle of elbowing necessary to minimize the
reading error; while in the S-shaped arm the angle is incorporated into the
bending of the tube, and therefore the head is straight. This represents an
advantage and isr />
As for the
characteristics of rigidity, weight, accuracy and cost, the straight arm has
clear advantages. Perhaps aesthetics favor more curved.
The operation of
handling a turntable arm by hand to place it at the beginning of the disc or in
any part requires a good pulse, to avoid damage to the needle, which being very hard (diamond),is very fragile and can be broken with a sudden blow. To
avoid these risks, the arms are provided with a lifting mechanism that is
operated with a lever.
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