Kuzma STOGI REF 90630 - Manual (Page 19)

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Appendix 2
Fine Azimuth Adjustment
This can be done using an oscilloscope and a test record or by using good records in a
good system and listening to the sound. Cartridges with fine profiles (VDH,
Microline etc.) are more sensitive to this adjustment. On the other hand cheaper
cartridges are not made so well, making fine adjustment more useful.
With an oscilloscope we measure the differences in crosstalk between both channels.
The idea is that on both channels this is equally small. For that we need a test record
with tracks recorded for left and right channels separately. Then we compare
crosstalk from the left channel on the right channel- which is a very small signal, to
the same type of signal from the other channel. By adjusting azimuth, crosstalk on
both channels should be made equal.
Listening from LP:
Start listening with the tube in zero position, with the marking lines aligned. Listen to
the sound-stage, the focus and the stability of the instruments. Release the two
locking screws and rotate the Allen key so that tube rotates for approximately the
width of the mark. Listen and then rotate tube for a similar amount in the opposite
direction and again listen. Adjust the arm to the position in which the best sound was
obtained. In this position make further adjustments by turning the Allen key for a
quarter turn in one direction, listening and then turning a quarter turn in the other
direction and listening.
Continue this process making ever decreasing adjustments, 1/8 of a turn, then 1/l6 and
so on. When optimum results are obtained fix the locking screws. To remember the
position of the azimuth, imagine that the inserted Allen key acts as a dial on the clock.
NOTE: During fine adjustment only gently fix locking screws during listening.
The adjustment screw is highly sensitive and the smallest pressure on the Allen key
will alter the azimuth and sound.
Do not attempt any adjustment when the locking mechanism is locked. Although no
damage can be done.
Significantly improved sound can be obtained by paying attention to azimuth
adjustment prior to final VTA adjustment.