ADJUSTING THE MAGENTA TT10 TURNTABLE
TECHNICAL SPECIFICATIONS OF THE ARM
The alignment of cartridge and arm has to be done in accordance with the technical specifications given by the manufacturer of the pick up
arm:
* total tonearm length,
* effective length,
* overhang and
* offset angle (angle of headshell in relation to the arm tube; this angle changes in relation to the length of the arm).
Overhang is the distance between needle tip and center of the spindle. This can be seen when the cartridge is placed above the spindle (if the
arm does allow this). The effective length is the distance between pivot and diamond tip The offset angle is the angle between head shell and
arm tube
A tangential arm does not have overhang and no offset angle. The stylus should follow a straight line at a rectangular angle with the arm,
going from periphery to lable, ending at the center of the spindle. See the Rabco page.
The data of the manufacturer make it possible to determine the correct position of the arm in case you add an arm to a motor unit. Many
times one encounters a tonearm which is not built according to the findings and theories devised by various technicians, researchers and
mathematicians. One famous name in this respect is that of American engineer H. G. Baerwald. But even if the data of the arm are not
according to the findings, it is possible to find the best position of the pivot in relation to spindle and cartridge, and in relation to the groove.
No need to worry. And no need to study mathematics and trigonometry.
Much research has been done and many articles have been written about how to minimize the lateral angle to the max. I do not want to
bother you with equations. After all we have to be practical.
You may decide for yourself if you want the least distortion in the inner grooves (close to the label) were generally the most distortion is
generated. Or you may align the cartridge in such a way that zero distortion is achieved at distances of 66 mm and 120.9 mm from the spindle.
You can draw a protractor yourself. Or just print the following drawing in real size. Each square should measure 5 millimeter. If necessary
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