Kuzma Stogi Reference - Manual (Page 15)

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STOGI/STOGI REFERENCE 15 KUZMA
F. Fine VTA Adjustment
VTA describes the angle between the record surface and the stylus (Fig. 21). This
angle changes as the height of the tonearm is altered. The standard angle is 15° but
cartridge manufacturers work with degrees of anything between 10°- 30° so only by
listening tests can one ascertain the correct angle for your particular cartridge. The
VTA also varies according to the tracking force and thickness of records. For your
information to change the angle by 1° means a change in height of approximately 3
mm on the pillar. Some styluses need more precise adjustment of VTA than others.
The most sensitive profiles are Van Den Hul and Microridge types.
1.With felt pen mark the position where the pillar meets the base as a point of
reference.
2. Use a good recording, preferably acoustic instruments and listen.
If the tonearm is too low the sound has a tendency to have an overblown base and
the stereo picture is imprecise.
If the tonearm is too high the sound tends to be too bright, ie. too aggressive,
especially on acoustic strings.
3. Try moving the tonearm up for 3 mm and down for 3 mm to judge where the arm
sounds most balanced with more precise stereo picture. (This is similar to focusing
a camera). Fine adjustments can be made in the range of 0.5 mm.
4. VTA can also be altered by changing the tracking force. An increase in tracking
force is equivalent to lowering the tonearm and vice-versa.
5. Now fix height firmly.