Braun A1 - Installation; Connecting the Cables; Protection Circuits

Installation
The
Braun 41 integrated
amplifier
can
be
placed
without regard
to acoustic
qualities
of the room
or to the
speaker location.
The
choice
of
location
depends
entirely upon
personal
convenience.
The
amplifier
and the
other
components in
the HiFi
system
(Braun
T1 tuner, Braun
P1
turntable
and
Braun
C1
cassette deck)
can
either
be
placed
beside
or on top
of
each
other.
Should
they
be
placed
in
a tower,
the
following
order is recommended
(from
top
to
bottom):
turntable,
tuner,
amplifier,
cassette deck.
The
indentations
in
the top
accept the
feet
of
the unit
placed
above
and
prevent
the
units
from
sliding.
Although
the
amplifier,
due to its modern
solid
state design remains
cool, allowance
should
be
made
for
free
circulation of
air
around
the side vents.
The
amplifier
should
be
set on
a
hard
surface
so as not to
hinder
the
air circulation
under
the amplifier.
When
installing
the
amplifier
on a shelf
or in
a
cupboard,
please
ensure that it is fitted
in
such
a way
that the
warm
air can dissipate.
Connecting
the
cables
The
Braun
A1 HiFi integrated
amplifier,
as
the
other models in
the series, is
so
con-
structed
that
enough
room is left
between
the
sockets
and the
rear flap
to accomo-
date
the
cables. Once
the
cables
have
been
fitted,
the rear
flap
can be
mounted
into
the
grooves
(32).
The
amplifier is
delivered
without
connection
cables.
Suitable cables
are
supplied
with the
complementary
Braun
products,
T1
tuner,
P1
turntable
and C1
cassette deck.
Should
at any time
another
connection
cable
be required,
this must be fitted
with
cinch
jacks.
All
sockets
(with
the
exception
of
the front
located
headphone
jack
(2))
are
cinch
type.
Power
supply
The
Al amplifier
should
be
connected
to a
22OV, AC
supply.
Conversion to another
voltage
supply
should
only
be carried
out
by
a
qualified
technician.
Loudspeaker
connection
In
totalfour loudspeakers
can be connected,
e.
g.
two
pairs
for
stereo
effect
in
two
rooms.
Should the
suitable
Braun loudspeakers
not
be used, it is necessary
to
consider
the
amplifier
output when
choosing
speakers.
This
is
50 watt at
8
ohm, 65 watt
at 4
ohm
(rated
per
channel).
To
ensure
good
repro-
duction, all four
speakers
should be
of
the
same type.
The loudspeakers
are fitted
to the
push-in
connectors
(29,30)
as
follows:
push
the
bare
end of the loudspeaker
wire
into the
opened
connector,
then close it.
Please ensure
that
the
loudspeakers
of a
pair (1
or 2) are
con-
nected
in
the
correct
phase
i. e. the right
colour
or sign
of the
connector
is
connected
to the
correct
polarity (*
or
-).
The
loud-
speakers
should
be
placed (R:
right,
L:
left)
in
the
correct
position
in
the room.
The
distance
between
the
speakers
should
be
about
the same
as the
distance
between
the speakers
and the listener.
Loudspeakers
which
are
delivered without
cable
should
be
fitted
with
a cable with
a
minimum
cross sectional
area
of
0.75
mmz/
AWG
18.
Connections
to tuner,
turntable,
tape deck
and cassette
deck
One
tuner,
two turntables,
two
tape decks
or cassette
decks
and
another
sound
source
(aux)
can be connected
to the 41
amplifier.
From
the
design
and technical
standpoints
the 41
amplifier is
compatible
with
the Braun
HiFi
components
T1 tuner,
P1 turntable
and
C1 cassette
deck. lt is
best to
place
the
other
components
close
to the
41, as
a
very
long
connection
cable
leads
to a reduction
in the
high
frequencies.
The
other
components
are
connected
using
sockets
(19)
to
(26).
The
"phono"
sockets
(19)
and
(20)
serve as
connectors
for mag-
netic
pick-up
cartridges.
Other sources
can
be connected
to the
"aux"
socket
(22).Tape
decks
and cassette
decks
use
sockets
(23)
to
(26)
("tape
1" and
"tape
2"). The
sockets
*out',
bring the
signal to
the
tape deck whilst
the
sockets
..ino
transfer
the
signal from
the
tape
deck to the
amplifier.
Operating
instructions
The
41
amplifier is turned
on by depressing
the
power
button
(1).
The
LED
control
,.on',
in
the
display
(14)
illuminates.
A
delay
switch
ensures that
the
loudspeakers
be-
come
operational
a few
seconds
later. This
measure
is to
protect
the
speakers during
switching
on and
off.
The loudspeakers
are
activated
by buttons
(3)
and
(4).
You
can also
press
both
buttons
at
the
same time
(pairs
1 and 2 in
use simul-
taneously)
or
push
in
neither
button. In
this
case
all loudspeakers
are switched off and
only headphones
can
be used.
lmportant:
Should both
buttons
(3)
and
(4)
be
pressed
and
only one
pair
of speakers
is
connected,
there will
be no transmission
of
the signal.
The
source to
be
heard
through
the loud-
speakers
is
selected by
turning
the rotary
switch
"input
selector"
(16).
The
signal from
another
source
can be recorded
on tape
simultaneously
but
completely
independant
of the
source
being heard.
The source
to
be
recorded
is
selected
by
means
of the rotary
switch
"record
selector"
(15).
Recording
from
tape to tape
is
possible
by selecting
either
switch
position
"tape
1-2,,
or
"tape
2-1,,.
The various
setting
possibilities
afforded
by
using
the
rotary
switches
(15)
and
(16)
in-
clude tape
monitoring
facility.
Please
see
the
section
"Control
setting
instru€tions".
Protection
circuits
The
amplifier
is fitted
with
an electronic
pro-
tection
system
against
shorting
in the
loud-
speaker
circuits
and thermal
overloading.
The
amplifier
will
automatically
turn
itself
back on
once
conditions
have
returned
to
normal
i.
e. the heatsink
parts
have
cooled
down sufficiently.
The
electronic
protection
does
not
switch off the
LED
display
(14).
Fuses
Should there
be
a breakdown
not detected
by the electronic
protection
system
or a
defect in
the unit itself,
the
built-in
safety
fuse
will
be
activated. Then
the
LED display
"on"
will
no longer
be illuminated.
lmportant:
Please
switch off
the unit. Please
see a specialist
regarding
fault
analysis
and
the installation
of a new
fuse.
Gontrol
setting
instructions
Basic
control
position
It is recommended
to
set
all controls in the
normal
position
i.
e. switch
off
push-buttons
(5)
to
(9)
anO set the rotary
controls
(11)
to
(13)
to their
centre
position.
lt would
also
help to
switch
off the
"display
sens> switch
(10).
Now
only
prevailing
room
acoustics
and
personal
preferences
need
be con-
sidered
when
setting the controls.
Volume
adjustment
The
basic
control
position
does
take
into
account
that the human
ear recognizes
high
and low frequencies
less well
than mid-range
when the
amplifier is
played
quietly.
By
slightly lowering
the mid-range
frequencies in
relation
to the high
and low
frequencies
at
lower
volume
levels
a
uniform
total response
at all
volume
settings is experienced.
This
loudness
compensation can
be counter-
manded
by activating
push-button
"linear"
(9).
The frequency
response
is
then linear as
long as the
basic control
positions
are not
changed.
High
cut
and subsonic filter
The
reproduction
from older
tapes
and
records
is
often accompanied
by a hissing
noise.
A
disturbing low frequency
rumble
can also
be heard
with old
records
and
tapes. By
using
the 30 Hz
filter
(push-button
(6))
or the
7.5 kHz filter
(push-button
(7))
the
level
of
rumble
and hissing
can be
greatly
reduced.
Both
filters
should
only be used in
the
specific
cases mentioned
above.
Push-button
<tone
defeat,
(5)
This
de-activates
rotary
controls
(11)
and
(12)
for
bass and
treble functions.