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SECTION
2.0
INSTALLATION
ANO
USE
2.1
Upon
receipt
of
the equipment, inspect
for
shipping
damage.
Should
any
be
observed,
notify
the
carrier
irrmediately;
if
not,
proceed
as
outlined
below.
It
is
suggested
that
the original ship-
ping carton
and
materials
be
saved for possible future reshipment.
2.2
The
375
is
packaged
to
mount
in a standard
19
-inch equipment
rack, requiring 3½-inches
of
panel space.
When
replacing original
electronics
in
an
overbridge
above
the
transport,
it
may
be
necess-
ary to
drill
and
tap
an
additional
two
holes
to
accommodate
the
375
panel .
2.3
The
signal,
head
and
transport
connectors are d.irectly compatf-
bl~
with
Ampex
350,
351
and
354
equipment. Units ordered
for
use
with
other
transports.
or
for
use
in stereo pair~ are s·upplied-
wi_th
a_ppropr:__iate
_·
interconnect cabling.
2.4 Unless supplied otherwise
to
special
order,
units intended
for
mono
or
stereo
installations
are delivered properly aligned
for
use
with
3M
206
tape
at
an
operating level
of
200nW/m,
with
Ampex
351-
type
heads
(1.5mHy
erase,
5-lOmHy
record,
and
lHy
reproduce)
and
lOOkHz
bias. Units
for
multi-track
use
normally operate with lower
inductance heads
(0.5mHy
erase,
4-5mHy
record,
and
400mHy
reproduce),
utilize
250kHz
bias,
and
incorporate the optional
SYNC
reproduce
amp-
lifier.
Heads
with inductances
other
than those suggested
above
can
be
accommodated.
Section
4.1.4.2
outlines
the necessary changes.
2.5
As
delivered, the
375
is
calibrated
to operate
at
a
+4dBm
signal
level.
Should
operation
at
+8d8m
be
necessary,
clip
the
jumper
shun-
tingthe
4.7K
resistor
near the
line
output connector
and
recalibrate
as described in paragraph
4.1.2.8
.
2.6
The
low
source
impedance
of
the
375
line
output
results
in only
about
½dB
level
change
from
an
unloaded to
600
ohm
loaded condition.
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