Kuzma AIR LINE 2007-6 - Manual (Page 11)

11
Move the cartridge along the headshell to such a distance, that the tip of the diamond
(needle) is on the line on the protractor, which goes from centre of record towards
edge of record. This is the line where the tip of the diamond will be 'tangential' to all
grooves on an LP.
Using the cueing device, just lift the needle above the protractor for a mm or so. Move
the tube along to see if the needle is travelling along this line. If it is travelling
parallel to the line but in front or at the back, then reposition the cartridge. But if it
travels at an angle to this line, (eg if tip is at line 66mm but not at 121 mm ) then
rotation of the tonearm must be repeated. The protractor was not precisely aligned
against the base, or the cutout for position of the armbase was not precise.
Experimenting with small rotations of the tonearm will solve the problem. The tip of
the diamond must travel parallel to the centre line, even if it is in front or behind. Now
simply position the cartridge backwards or forwards. When you are sure check by,
actually lowering the tip onto the protractor. The cantilever will deflect due to the
tracking force.
When this is complete the needle should travel along the line. We must achieve a
tangential position on the grooves. Rotate the whole cartridge without moving it
along the headshell, so that cantilever is tangential to the parallel lines. Just chose one
and then align the cantilever to be parallel, by twisting the cartridge body in the
headshell. When this has been done, check again if the needle travels along the line
from the centre of the spindle. Check again, if cantilever is in a tangential line. Fix
the cartridge screws one at a time, gradually, being sure not to move the cartridge.
After the cartridge is firmly secured check geometry again.
Note: Do not use the damping facility while levelling the tone arm!
Now you can start playing LP. On spinning record gently lower the needle into the
first groove. When the needle touches the record it will move in and out a little before
settling into the first groove. If it moves inside, skipping a few grooves or drops from
the record, that means that the horizontality of the tonearm is not correct.
If it jumps out towards the edge of the record, then the tonearm is tilted too much
downwards towards the edge of the LP. You must raise that part of the turntable. If it
moves inwards, towards the centre of the record, then it is tilted too much upwards and
you must lower that part of the turntable.
5. Horizontal fine levelling of the tone arm:
Bring the cartridge above the LP in the middle of the modulated grooves having cueing
device in the upper position. Then lift up the headshell and let it drop back towards LP.
The cueing device being in the “up” position will prevent the cartridge dropping on the
LP. The headshell will bounce up and down because rod of cueing device will restrict
movement of the threaded rod of counterweight at the back. At the same time the
whole assembly while drift sideways in one direction, or only move very little.
Try the same experiment above outer perimeter of LP and also at the inner grooves