Quad 405 Mk2 Owners manual
4052 Current
Dumping
Amplifier
Instruction
Book
ouRD
Current
Dumping Amplifier
4C/5-2
INSTRUCTION
The
book thoroughly before connecting
CONTENTS
Preambfe Page Number
Packing
Service ....2
Guarantee ........2
Description
Specification
lnstallation
AC Input. . .
Earthing
Fuses.
Input connection.
I nrrdsneal er aonaAaliof
I orrdsnp:kpr nrntpr-t;nn
Or rtnrrl I imitor
Ouad electrostatic loudspeaker .
Loudspeaker
Heeclnhnnoc
Addit or'aL lor,dsnpaf crs
405-2 is
Ouad
(Grounding)
capable of
.
phasing
BOOI<
very high
output
your
loudspeakers.
levels. Read
.......3
.....10
Page Number
this
....2
4
5
5
6
6
6
1
7
B
B
I
Acoustical
The
HUNTINGDON,
Cambs.,
PE1
B 7DB.
Telephone
Telex:
Ouad
oto59EC
No.: Huntingdon
32348 OUAD G
is a reglstered
Manufacturing
(O4BO)
trade mark
Co.
52561
Ltd.,
Packing
The amplifier
speaker
mains
spare
expanded
retained
is supplied
connectors,
fuse. The
polystyrene
re-use in case
for
with an
voltage
two
packing
and a cardboard
shell
the unit
lead. mains connector,
input
limiting shorting
material
comprises a
has to be
carton
returned at any
links, and
part
two
and should
four
a
be
time.
Service
lf servicing
supplier,
Acoustical
giving your
Ouad
bank
0480
Clrcuit
available
to the agent
offers
holidays.
52561
diagrams
from the
is required the amplifier
for the country
Ltd. A brief
Manufacturing
name and address
same-daV
The map below
to tell
and service
manufacturer or distributor
Co.
service
us that
plus
from Monday
shows
you
are
for this
data
should
purchase
of
reason for
the
where to
coming.
Ouad
returned to the
be
to the
or
note should be enclosed
returning it.
to Friday except
find us. Please
product
for a small charge.
for
call
are
Guarantee
This amplifier
workmanship
purchase.
Within this
of charge
accident or
unless by
Within the U.K.
not limit the consumer's
guarantee
guarantee
)
guaranteed
is
period
for a
period
we undertake
provided
negligence.
local agreement.
the
is not supplied
card
begins on the day on
failure was
that
Labour and carriage
guarantee
against any
twelve
of
to supply
offered
existing statutory
with
which
defect
months
not occastoned
with this
your
Ouad
you
in material and
from the date of
replacement
costs are
equipment
rights. A separate
unit.
take delivery.
parts
by misuse,
not
covered
does
Your
free
Description
The
intended for
Ouad
405-2 is
in high
use
a two channel
quality
amplifier is usually used with a
power
amplifier
sound reproducing systems. The
control unit though
Ouad
signal sources can readily be accommodaled
The amplifier uses a current dumping
invention
which eliminates manv
transistor amplifiers. and covered by
In
a current dumping amplifier there is in
powered
very high
amplifier. The low
times,
all
calling upon the high
the muscle. The
signal - that
get
within
the target area of the
the remainder
dependent
solely
power
Problems
can be made very
of crossover. crossover distortion,
adjustment. thermal
There are no internal
power
transistor types is less restrictive.
quality
power
amplifier and a high
amplifier controls the
small amplifier is so arranged - it carries
provided
the larger
accurately and completely. The reproduced
on the small amplifier which
good
tracking, transistor matching, all disappear.
adjustments or a'lignments and the choice of
output circuit, a Ouad
the
of
oroblems associated with
patents
effect both a low
power
section to
power
transistors
required
output current
indeed.
primarily
other
in
several countries.
powered
heavy duty
loudspeakers
provide
most
an error
(the
dumpers)
it
will fill
quality
because of
quiescent
its
current
at
of
in
is
low
S mplif ed Schemat c of 405-2 Amplifier showing
and Bridge Components
Class A, Dumpers
405-2 is fitted with a
The
is a load-sensitive, time-dependent
This
problems
overcomes
The amplifier
B.5A
substantially
progressively
transistors
extreme
When the
current
the
will
deliver an
into any
load. lf
below
4fl
reduced to a
to remain within their safe
case of a short circuit
level falls or the short
signal
gradually
limit
This enables the amplifier
load when handling a normal music
any
nrntp.t;nn tho ^rtnlt
purelV
for
reactive
extended
an
circuit or
on signal
new
associated
instantaneous
load is too
the
the current
,
value which enables the output
this value
returns to its initial
to deliver
deViCeS
frOm
loads.
period (minutes)
INSTALLATION
The Ouad
sight
The Ouad
must
n:hinet nr cr rnhn:rd
lf
used
cartridge,
radiation from the
by
The current
enables
programme
normal temperatures
When operated
heatsinks
405-2 carries no controls
in a cabinet or
405-2 is
always
be adequately
in
close
care
any other
provided
proximity
should
be taken
to the control unit,
mains transformer of
dumping
robust transistors
extra
qualrty
crrcuit technique
and the amplifier
without compromising
power
high
at
hot
to be
the touch.
to
convenient
with a substantial
ventilated,
levels
Ouad-designed
current
with conventional
maximum current of
reactrve,
or of
limit is smoothly and
operating area.
is
3.1A.
circuit is
level.
peak
high
currents
programme.
SUStained
Shorting
OVerlOadS
both outputs simultaneously
is not
and may be
location.
particularly
tuner or
to ensure that
hum is
rhe 405-2.
in the Ouad
used
to be used
without
can operate
reliabiiity.
quite
it is
normal
protection
limiter which
circuit.
"load-line"
a resistance
In the
removed the
into
alnrost
fully
while
into ShOrt
protected.
mounted out of
heat sink, and
positioned
if
magnetic
not induced
405-2
impairing
higher than
at
for the
circuits
in
a
Input
AC
The Ouad
2OO-24OV
4O5-2 is suitable
.iOO-120V
or
Before connecting
voltage selector,
Voltages
affect
of up to
performance.
AC mains
the unit
which should
internationally
Blue neutral, see
located
10% above or
input is via a standard
agreed
Fig.
4
for use on either
AC supples.
the Ouad
405-2 to
the
on
rear
below the
three
be w red
code, Green/vellow
'1
.
in
accordance
the
panel
pin
5OHz or 60Hz,
supply
is
ensure
correctly
indicated
plug
Euro
with the
Brown
earth,
that the
set.
range do not
supplied
with
live and
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