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OR AL
ODE
wi h the open-reel Dolby
Level tape or
the
cassette.
Send
your check and
order to:
Customer
Service
Advent Corporation
195 Albany Street
Cambridge, Mass. 02139
Record Calibration
This
section
is divided
into
two parts. One
set of
instructions
applies
to
three-head
decks
capable
of
monitoring the tape while recording, and the other
applies
to two-head
recorder which
use
a combined
record/play
head
(such as cassette
decks). To
avoid con-
fusion, read
only
the
section appropriate
to
your recorder,
and
then proceed to the next
section, "Notes
About
Calibration".
A. Three-head
recorders capable of simultaneous
recording and playback
(such as
the Sony
366,
Revox A-77,
orTandberg6000,
etc.):
1.
Leave all
controls where
they
are
after Play
Calibration. Be
sure
that
your
recorder's
source/tape
switches are still set
to
"tape",
and the lOOA'
s
MODE
switch to
ORMAL.
2. Thread
a blank
tape
of
the
type you
regularly use
onto
your
recorder,
and set
it to record. When the
tape is
moving, slide
the
spring-loaded
REC CAL TONE
switch on
the Model lOOA to the
right and hold it there.
3.
What
you
are now doing
is
recording
a
tone
onto
the tape from
an
oscillator built into the Model lOOA.
While holding the REC CAL TONE
switch
on, watch
the Dolby
Level
meters
and
adjust
your
recorder's
record level
controls until
both Dolby Level
meters
read to the Dolby
Level
line.
Don't
be concerned about where your
recorder's
meters
read
during this
procedure.
It
is not uncommon
for them to read higher
than
the
point you
normally use
to
indicate overload.
You have
now completed the record calibration
procedure. From this
point on, the only controls you
touch on
your recorder are those which operate its
mechanical functions. All
level controls on your
recorder mu t be left alone,
except when you want to
re-calibrate.
B. Recorders with combined record/play
head (such as
cas ette
decks):
1. Leave all
controls
where they
are after Play
Calibration. Be
sure
that the Model lOOA'
s
.
ODE
switch
is till
set
to ORMAL.
7
2. Thread a blank tape of the type you regularly use
onto
your
recorder and
set
its tape
counter
to
"O".
Put
your
recorder into the
"record"
mode and use the
"pause" control
to keep the tape from
moving.
3.
Slide the Model lOOA's
spring-loaded
REC CAL
TONE
switch
to the right
and
while holding it there,
·
adjust
the record level
control on your
recorder so that
the Dolby Level meters on the Model lOOA read to the
Dolby
Level
line.
4. Release the recorder's
"pause" control, continu-
ing
to hold the REC CAL TONE
switch
on. Record 3 or
4
econds
of the tone
from
the l OOA'
s
internal osci
5.
Rewind the
tape back
to
"O" (where
the recor
you just
made
of
the tone
begins).
Playback the record
ing
of
the tone, and
note where
the Dolby Level meter
read relative to the Dolby
Level
line while playing b
the recording
of
the
tone.
Do
not change
the PLAY
control settings.
The
object is to have the
Dolby Lev
meters read between
the two dots on either side
of the
Dolby
Level
line. If they
do, you can skip step
6 and 7.
6. Reset the
tape counter to "O," and
record the
REC CAL TONE
a second time, as in step 4 above.
This
time,
before
you begin to record the tone,
adju t
your
recorder's record level
controls up or down
a bit
depending on
whether
in step 5 the Dolby Level
me
read
below or above
the
Dolby Level lin
.
·n
find
it easiest
to
concentrate on one ch
I at a
DDMJt:~._...._...,t
7. Play back
the
second recording
o th
TONE,
and again note how clo e
the D
lb
meters read
to between
the two dots.
Repea
play-adjust
procedure
(step 6)
sary
until the Dolby
Level me
two dots
on
the
playback of the
CAL TONE.
You
have
now co
From
this point on,
th
on your recorder are
th
functions.
All level
contr
l
left alone, except
when
y
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