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ALIGNMENT AND PERFORMANCE CHECKS
INSTRUMENTS
AND TAPE REQUIRED
Lg
Ampex Standard
Alignment
Tape or equivalent
7-1/2 ips (Ampex 31321-01)
(TEAC test tape, No.62801)
3-3/4 ips (Ampex 31331-01)
AC Vacuum
Tube Volt
Meter
capable
of indicating
rms voltages
of
.003V or less
Standard
AF Signal
Generator with
stable
output
from
50 cps to
15,000 cps.
Earphones
of Speaker
System
for monitoring
Reel of blank tape
(Scotch 150, 190 or equivalent)
Channel
Selecting Switch
HEAD HEIGHT ALIGNMENTS
(Fig. 9)
as
Watch tape as it passes
through head assembly,
and observe
the
position
of the tape
at each
of the heads.
Thread
a piece
of clear
tape
(or recording
tape with
oxide
coating
removed)
across
head
assembly
in the
observed
playing position.
Adjust
height
of heads
as follows:-
Erase head:
Top (front)
edge of head laminations
slightly (.0015") above edge of tape
Record head:
Top (front) edge of head laminations
flush with edge of tape
Play (Forward) head:
Top (front) edge of head laminations
slightly (.0015") below edge of tape
Play (Reverse) head:
Bottom (back) edge of head laminations
slightly (.0015") below edge of tape
NOTE:
Height adjustment
of heads when completed
should have all
head surfaces, when viewed from side, aligned parallel
with the tape
guide
surface.
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