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Mark
the
calibration positions on the recorder's
record and playback level controls
to
avoid the
necessity
of
re-calibrating after making a non-
Dolby
recording.
IMPORTANT:
It
will be necessary
to
re-calibrate the Dolby
levels when a change in tape
speed
has been made
or when a
different
brand or type
of
tape is used.
When the
Dolby
process is
not
desired on a re-
cording, record in the normal manner - adjusting
the record levels
with
the recorder's record level
controls. DO NOT change the 4270's
PLAY
CAL
controls.
USE OF
THE
DOLBY
SYSTEM ON FM BROAD-
CASTS
Your
Model 4270 is equipped
to
receive Dolbyiz-
ed FM broadcasts.
Most FM broadcasts do
not
currently
use the
Dolby Noise-Reduction system.
To
receive these
broadcasts, leave the
DOLBY
Switch in the
"OFF"
position. However,
if
a local station is
broadcasting a Dolbyized FM signal,
full
advan-
tage
of
the increase in signal-to-noise ratio may
be obtained by
putting
the
DOLBY
Switch in
the
"DOLBY
FM"
position. The rear panel
DOLBY
FM PRESET
LEVEL
controls are fac-
tory
-adjusted. Do
not
change the position
of
these controls.
FM DE-EMPHASIS SWITCH
This rear panel switch operates
only
when the
front
panel
DOLBY
Switch is in the
"DOLBY
FM"
position.
It
alters the frequency response
of
the FM signal. Normally, this switch should
be
left
in the
7511S
position. However,
if
the
station is broadcasting the Dolbyized signal using
a
2511S
pre-emphasis,
put
this switch in the
"25I1S" position
to
obtain
flat
FM frequency
response.
If
in doubt, call the station.
DOLBY
MODE
CHART
This chart indicates the correct
DOLBY
Switch
positions
for
various types
of
input
material.
The
input
format
is indicated in the
left
column
and the appropriate
DOLBY
Switch position,
together
with
FM DE-EMPHASIS Switch position,
is shown under the appropriate mode of opera-
tion
.
'~
De-Emphasis
Dolby Switch Position
Mode
Switch
Listen ing
Record
Input
Position
W
ithout
Dolby With Dolby
F.M.
75J1.S
"Off"
"Off"
"Record
I"
(Normal)
F.M.
with Dolby
7511s
"Dolby
FM"
"Record
II"
"Dolby
FM"
If
7511s
Pre-emphasis
the
F.M.
with Dolby
25J1.S
"Dolby
FM"
"Record
II"
"Dolby
FM"
rect
25J1.S
Pre-emphasis
Non Dolbyized
sources
"Off"
(Phone, Tape,
-
"Off
"
"Record
I"
Aux inputs,
"Record
I"
A.M.)
terial
Dolbyized
sources (de-
rived from
"Play"
"Record
II"
"Play"
to
"Tape"
or
-
"Record
II"
mode.
"Aux"
inputs
etc.)
For initial calibration, utilizing
the
Dolby standard alignment tape, see detailed instructions
on Pages 14 thru 16 of this manual.
Notes :
-
there
is a
doubt
regard-
ing
the
pre-emphasis used on
transmission,
the
F.M.
station should be contacted,
where possible, to ensure cor-
position for de-emphasis
switch.
Pre-recorded
tape
manufac-
turers indicate when
the
rna-
has been recorded in a
Dolbyized format. Home reo
corded tapes should also be
clearly marked as
to
format,
ensure
correct
play back
Table
1.
Dolby
Mode
Chart
16
20


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