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TAPE DECK
20.
TAPE SPEED AND STANDARD SELECTOR
This is a
four position
rotary
switch permitting
the
selection of
the
speed and standard of
the IV- S
in
both
record
and
playback
.
Possible
settings
are:
3-1
IpS
(9.525 cm/s) NAB/CCIR
7t
IpS
(19.05cm/s)
NAB/CCIR
15
IpS
(38
.1Dcm/s ) NAB/CCIR
15 IpS
(38. 10cmls)
NAGRAMASTER
For best quality recordings the
15
ips
speed
is recommended
.
The
15
ips
NAB
I
CCIR positi on is
chosen
when the recorded tape is to be played back
on
any machine
other
than
a
NAGRA
T·AUDIO
or
NAGRA IV-
S.
However,
when
this is not
the case it
is recommended to
use
the
NAGRAMASTER position
which
has a different
equalization and gives
a bettor
signal-to-noise
ratio.
For norm al
recordings.
the 7
t
ips speed
is
supplied.
The
3i-
ips speed is available for those
cases
where the length
of
recording
time of
the tape is more c
ritical
than the actual quality of
the
recording.
21. BIAS
SELECTOR
This switch
makes
it possible for
the
operator
to modify the bias voltage
using a small screwdrive r
when
recording
on special
tapes tor which the machine has not been
calibrated. Each position of
this
switch corresponds
to a
bias variation of
S%.
22.
PLAYBACK
EaUAlIZATION
SELECTOR
This
switch (also
adjustable
with a small screwdriver) offers
the
possibility
to reproduc e tapes
recorded using the
CCIR standard equalization on
a machine
that
has
been calibrated
to the
NAB
standard equalization,
and
vice versa.
23.
REWIND
AND
FAST
FORWARD SWITCH
REWIND
REW.
444
FAST FORWARD
~~~::'N~
is
possible with main selector
(4)
in any
position
other than
STOP,
assuming
pinch
roller lever (32) is
in
the fully
open
position.
is
possible only
with main functi on
selector
(4) in
the playback (with
loudspeaker)
position and pinch
roller lever (32) fully
engaged.
The
central
position of
this switch
is OFF
and
ttus is the
position that the switc h should
be
in
whenever
the
machin e is not required to
spool.
Keeping
it
in this position will prevent accidental
spooling of the
tape when
opening
the pinc h
roller gate or
playing
back
a recorded
tape thr
ough
the
internal loud
speaker.
24.
& 34. TAPE
REELS
The IV- S ca
n
be used with
reels
up to a maximum
diameter of S"
(127
mm) with the ptexi-qfass lid
closed, or up
to 7"
(178
mm)
with the lid
ope
n.
However,
if
the
aSET option
is fitted to the
machine the 7"
(178 mm)
reels may be used
with
the
lid closed.
If it
is necessary to use reel s
of
up to 10"
(2S4
mm), then the
aG
B
large reel adapter
may
be
used. See
chapter V of thi
s manual.
June 1888
I 1.4-6
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