Technics RS-BR465

Recording
with
High
Tone
Quality
Bias adjustment function
When recordings are made with the same recording level into
same type (but different brands) of tape, (regular or “normal” tape,
for example), you may notice that the reproduced high-frequency
sound is different from one tape to an other.
The reason that such differences may be noticed is because there
are differences in the frequency response (particularly in the treble
range) between cassette tapes of the various manufacturers.
Although a noise-reduction system is used the recording and
playback processes at the same recording level, a difference of the
frequency response will result in the processes of recording. Such
a problem cannot be corrected in conventional recording system.
In order to overcome this problem, this unit includes a bias-
adjustment control (for compensation of the frequency response)
so that the most appropriate recording can be made.
Level T
(dB) Adjusting the bias current, the high-frequency range is
compensated.
+3
-3
1k
Frequency (Hz)
During recording
1 Make a recording as explained in steps 1
through 12 of “Recording”.
(Refer to page 11.)
2 While the switching back and forth between
the original sound source and the recorded
source by using the input selector on the
system amplifier, adjust the bias-adjustment
control so that the treble tone quality is the
same.
It may be helpful, as a reference, to adjust the bias during
between-station noise heard on the FM band. The adjustment
will be made more precisely by listening through headphones.
Connect the headphones to the headphones jack of the
amplifier.
Bias becomes
. 2 Bias becomes deeper;
shallower; the treble = = = the treble characteristic
characteristic oN YL decreases.
increases. bias adjust
3 After repeating the above steps if necessary,
rewind the tape and then begin the recording
again.
Notes:
When
metal-coated
tape
is
used,
there
is
almost
no
difference
of
bias
characteristics.
Therefore
the
bias
adjustment
is
not
neces-
sary.
eThe
bias
readjustment
is
not
needed
as
long
as
you
continue
to
use
the
same
type
and
brand
of
tape
that
was
used
when
the
adjustment
was
first
made.
Refer
to
the
diagram
below
when
adjusting
the
bias
to
match
a
specific
tape.
Normal
TDK AD, SONY HF, That's RX,
AGFA LNX
CrO2
TDK SA, SONY UX, maxell XLII,
Fuji FR-II, DENON HD6, That’s EX,
BASF Chrome Extra II, MEMOREX CRII
Normal
maxell UR, Fuji DR,
BASF LH, MEMOREX dBSI
CrO2
Scotch XSI],
AGFA CRX
CrO2
SONY UX-S
Seg
bide adjust
Note:
The
diagram
shows
recommended
values
based
on
representative
tape
characteristics.
There
is
no
guarantee
that
they
will
produce
optimal
results
in
all
cases
due
to
slight
variations
between
individual
cassettes
and
cassette
decks.
Because
the
pilot
signal®
in
the
FM
stereo
broadcast
signals
is
subjected
to
Dolby
noise-reduction
processing
in
the
same
way
as
the
music
signals
when
an
FM
stereo
broadcast
is
being
recorded.
There
will
be
deterioration
of
the
tone
quality,
and
the
noise-
reduction
effect
is
reduced.
This
unit,
however,
is
provided
with
an
MPX<
filter
that
filters
out
the
pilot
signal.
Note
that
the
MPX
filter
has
no
audible
effect
upon
the
tone
quality.
This
switch
is
used
during
the
recording
of
an
FM
stereo
broadcast
to
prevent
misoperation
of
the
Dolby
noise
reduc-
tion.
This
switch,
however,
should
be
switched
OFF
when
a
sound
source
other
than
the
FM
broadcast
is
being
recorded
*Pilot signal
The
pilot
signal
is
used
to
separate
the
FM
stereo
broadcast
signals
(left
and
right
channels);
this
signal
is
generated
on
a
19
kHz
frequency.