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duces a voltage
in
the
playback head.
Th
e design
and
construct
ion
of
these
heads
is extremely critical.
Their
surfaces
are
lapp
ed
to finishes so smooth
that
var
iatio
ns
are
meas
-
ured
in
wave l
engths
of
light.
In
typical play-
back heads
the
gap
is .00025
inch,
which give
an
indication of
the
precision required
in
build-
ing
the
heads.
Each
of
these
heads
is designed for a specific
function with
no
compromise
in
the
overall
head assembly. Professional
use
demands
top
performance
and there is
no
room for design
compromise.
Th
e
superb
design, engineering
and
manu-
facturing care built
into
Ampex h
ead
assem-
blies
assures
dependable
long
life
and
econo-
mical operation
at
the
low
est
cost
per
operating
hours.
A portion
of
the
section following w
ill
de-
scribe briefly by photography
the
different
types
of
heads
used
in
Ampex Series 351 equip-
ment
and
a few significant features
of
develop-
me
nt
and
alignment.
Head assemblies
of
the
Multichannel equip-
ment
ordered through Ampex Corporation by
including
in
formation relating to equipment
type,
equipment
serial
numb
er, Ampex catalog
number
and
the
description
of
the
part.
Head
Assembly
Th
e h
ead
assembly is hou
se
d
in
a die
cast
housing
an
d
contains
three heads used
in
the
Full-trach
head
assembly
6-2
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