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Mid-Frequency Trackability Test
(BANDS 5, 6, 7, & 8. SlDE 1 LATERAL)
The display for the mid-frequency test is ob-
tained by depressing the "Low/MidM button
on the test panel. The display will resemble
Figure 22, while the pickup is tracking. Mis-
tracking will change the display to resemble
Figure 23.
Low-Frequency Trackability Test
(BANDS 5, 6, 7, & 8. SlDE 2 LATERAL)
With the "Low/Mid"
button still depressed
and pickup tracking, the display will resemble
Figure 24. Mistracking will change the display
to resemble Figure 25.
Note: The exact display for the low- and
mid-frequency tests will again de-
pend on the particular pickup and
record. Also, in the presence of a
record warp, the operator must judge
when the pickup is mistracking a
band most of the time.
IX. CHECKING WEAR OF THE SHURE
TTR-103 AND TTR-109
A log of usage of the TTR-103 and TTR-
109 should be maintained, since a record
should be used only for a limited period of
time. After about 25 tests, the record
should be checked bv using a cartridge of
known trackability. The TTR-103 should
be compared to another copy of the TTR-
103. The TTR-109 is identical on both
sides, so one side should be compared
to the other. In either case, the cartridge
should exhibit the same tracking capabil-
ities, and a similar pattern should be
observed on the oscilloscope for corre-
sponding bands on the new and used
records. When a major difference is
noted, a new TTR-103 should be used, or
the TTR-109 should be turned to the new
side. When substituting a new TTR-103 or
using Side 2 of TTR-109, a new record
should be ordered, so that one new copy
will always be available.
Fig. 22
Fig. 23
Fig. 24
Fig. 25
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