Philips N4506 - Maintenance and Technical Data; Echo Recording Procedure; Maintenance; Storage of Tapes

mounted
‘in
line
(fig.
6).
When
making
an
echo
recording,
the
signal
just
recorded
on
the
tape
by
the
recording
head
©
is
immediately
reproduced
by
the
playback
head
©).
This
playback
signal
is
then
fed
back
to
the
recording
head
and
recorded
_
together
with
the
original
signal.
The
echo-effect
is
due
to
the
distance
between
the
two
heads
and
depends
on
the
tape
speed
used:
at
the
relatively
low
speed
of
4.75
and
9.5
cm/s,
*slow’
echo
effects
are
obtained
and
at
the
higher
speed
of
19
cm/s
a
‘quick’
echo
effect
(‘reverberation’),
can
be
simu-
lated.
Connect
the
monitor
socket
@
by
means
of
an
additional
stereo
connecting
lead
4822
321
20207
(EL
3768/14)
-
to
the
line
in/out
socket
@
or
the
‘aux’
input
socket
@)
when
recording
from
the
microphone.
In
this
case,
turn
back
a
little
the
monitor
output
level
controls
©
and
@).
The
recording
level
of
the
echo
signal
is
now
adjusted
with
the
controls
6)
and
©.
-
to
the
stereo
microphone
socket
@4)
when
recording
from
another
sound
source.
Set
micro-
phone
sensitivity
switch
@)
to
'-20dB’.
The
recording
level
of
the
echo
signal
is
now
adjusted
with
the
controls
@8
and
@).
You
can
now
make
a
mixed
recording
with
the
original
signal
and
the
echo
signal
provided
by
the
monitor
socket.
During
recording,
monitor
selector
@
must
be
in
position
’A’.
The
recording
level
meters
indicate
the
sum
of
the
recording
levels,
so
it
is
advised
to
adjust
the
recording
level
of
the
original
signal
below
normal,
because
the
echo
signal
is
still
to
be
added.
The
mixing
ratio
between
the
original
signal
and
echo
signal
can
be
heard
through
a
headset.
Maintenance
It
is
advisable
to
remove
at
regular
intervals
the
dust
and
dirt
which
has
collected
on
the
heads,
and
we
advise
you
to
do
this
using
cleaning
tape
811/CT,
which
is
played
through
once
as
an
ordinary
tape.
Doing
this,
bracket
&
(fig.
4)
must
be
in
position
B.
Cleaning
should
carried
after,
say,
every
50
hours
of
operation
or,
on
average,
once
a
month.
The heads may also be cleaned, however, using a
soft
cloth
or
a
cotton
bud.
To
clean
in
this
way
proceed as follows:
e@
Ensure
that
the
recorder
is
disconnected
from
the
mains.
@
Press
in
the
narrow
sides
of
head
cover
@4
and
remove
(fig.
3).
@ Moisten the cloth or cotton bud with a little
alcohol or proprietary cleaning spirit.
@ Now clean the tape tension stabilisers @9, the
pins
®)
(fig.
6),
the
tape
guides
©,
the
fronts
of
erase
head
@,
recording
head
(©)
and
playback
head
©)
the
capstan
@),
the
rubber
pressure
roller
©
and
the
switching
contact
@.
Never
use
any
other
cleaning
agents
and
do
not
touch
the
heads
with
sharp
or
metal
objects.
@
Allow
all
parts
to
dry
before
replacing
the
head
cover
and
reconnecting
the
recorder
to
the
mains.
@
The
drive
mechanism
must
not
be
lubricated!
Storage of tapes
After
use,
return
each
tape
to
its
box,
where
it
is
protected
against
dust.
Store
the
tapes
at
room
temperature,
not
in
the
sun
and
away
from
mag-
netic
fields
created
by
the
recorder,
radio
and
Tv-sets
and
loudspeaker
enclosures.
‘Technical data
(subject to change without notice)
@
Switchable
for
mains
voltages
of
110,
127,
220,
and
240
V.
©
Suitable
without
switching
for
50
and
60
Hz
A.C.
@
Power
consumption:
approx.
35
W.
@
Frequency
range
according
to
DIN
45
500/NAB:
19
cm/s:
35-25,000
Hz/35-26,000
Hz;
9.5 cm/s: 35-19,000 Hz/35-20,000 Hz;
4.75 cm/s: 35-11,000 Hz/35-11,500 Hz.
@
Signal-to-noise
ratio,
without
DNL,
acc.
to
DIN
45
500
and
NAB:
19 cm/s: >60 dB;
9.5 cm/s: >60 dB;
4.75 cm/s: >58 dB.
@ Improvement of the signal-to-noise ratio in the
4,000-14,000 Hz range using the DNL: > 10 dB.
@ Wow and flutter according to DIN 45 500/NAB:
19cm/s: <0.1%/ < 0.05%;
9,5 cm/s: <0.15%/ <0.07%;
4.75 cm/s: <0.3%/ <0.2%.
@
Maximum
speed
deviation
according
to
DIN
45500:
< +1%.
@ Suitable for reels up to 18 cm diameter.
e
Fast
winding
time
for
LP
18
(540m
of
tape):
< 180s.
@ Dimensions:
210 mm deep.
@ Weight: 10.3 kg approx.
e Socket 6, headphones: impedance 400-600 2
(pins 4 and 5).
@ Socket 6, micro | + st: sensitivity in position
’0 dB’: <0.2 mV/2 kQ (pins 1 and 4) or < 100 mV/
1 MQ (pins 3 and 5).
@ Socket 6, micro r: sensitivity in position ’0 dB’:
<0.2 mV/2 kQ (pins 1 and 4).
@ Socket 6, phono: sensitivity in position "X.TAL’:
<0.6 mV/1.5kQ; position MD’: <0.6 mV/40 kQ
(pins 3 and 5), max. attenuation 27 dB approx.
555mm wide, 430mm_ high,