Hafler DH-220 Owners Manual
WER
INSTRUCTIONS
AMPLIFIER
for
and
CAUTION:
IF THE
SOME DISTORTED
HEARD.
MALFUNCTIONS,
FOR
5910 Crescent Boulevard, Pennsauken,
SPEAKER FUSES
SOUND
THEREFORE
ALWAYS
BLOWN FUSES
THE
DAVID
IF AMPLIFIER
FIRST.
HAFLER
KIT
BLOW,
CAN BE
CHECK
COMPANY
New
OPERATION
ASSEMBLY
$.00
Jersey
1M128
08109
serial
number
regarding
Please
in
refer to this
all communications
this equipment.
The
Hafler
DH-220
designed
available
channel
home
tion
ability,
using
The
Hafler
and has
in the
to
either
power
applications,
of
types.
all
reliability,
the
very
DH-220
landmark
elicited
DH-l
l0
the
as
rating
A
and moderate
latest
circuit
glowing
preamplifier,
component quality,
wherever
combining
quely
types,
all
spectrum,
.performance
tion
tional
the
serious
to
self-destruct
So
amperes
The
delivers
delicate
the
ridges
ty,
and
load,
longer
you
feasible,
simple
and
and
to
the
accomplishes
resistance
direct
benefits
limitation
rugged
is
into
speed
-
unmatched
shadings,
capabilities
by
a
wide
ability
the
result
you
listen
will
be that you
the
effective
at
all
vanishing point.
achievements,
to
of
under
the
a
short
measured
textures
of the
margin.
to
deliver
is
absolute
to
is
a
very
highest
a
kit,
or
is
sufficient
and
its
design
combination
technology
is
refinement
a
which
has
reviews
using
for
example,
power
latest
circuit
power
levels,
new
a
high
abusive
of
MOSFET
conventional
other
DH-220
circuit!
transient
and
most
Coupled
adequate power
freedom
phenomenal
this
could
two
channel
performance
fully
assembled.
for
driving
assures
of
high
price
is
in
provide
to
of the
achieved
particular
since
worldwide
its
attention
polypropylene
for
superior
MOSFET
topology
over
the
In
addition
the
conservative
in
long
term
operating
conditions.
utilization
transistors
than
normal
that
it
can
deliver
as the
slew
linearity,
nuances
revealing
of
loudspeakers
with
its
from
amplifier,
not
have
made
power
audio
standards.
trts
I 15
all loudspeakers
extremely
performance,
the
Hafler
outstanding
DH-200
recognition,
1979
introduction.
has
been
or
film
sound.
technology
reduces
full
audio
to
its
distortion
pace-setting
mode
reliability
operating
and
This
in
overcoming
their
-
conditions.
more
rate
of
this
revealing
the
music,
unconditional
into
any loudspeaker
listening
the
a
better
fatigue.
more
INTRODUCTION
amplifier
It
is
per
watt
in
iow
distor-
depend-
tradition
capacitors
frequency
of
tenden.y
the
surpassing
anA
choice.
value.
design,
paid
with
uni-
opera-
excep-
is
one
than
ten
design
most
cart-
stabili-
The
certain
of
a
As
to
of
of
a
The
oversized
massive
MOSFET
to
the
a
and
which
porates
the
heat
output
achieve
art
sonics
high power
specifications.
The
fully
is
direct
all
highly
protecting
a
common
conservative
avoid
the
need
promise
audio
maximum
or
the
speaker:
and
loudspeaker
the
audio
signal.
Those
who
will
find
that
heat
sink
greatly
assemblies)
simplifies
few hours
modular
the
tire
arrangement,
other
requires
amplifier
Accessories
monophonic
an
alternative
voltages.
Through
tionist,
and
technology
power
sinks;
the
devices
exceptional
and
specifications.
monophonic
complementary,
coupled
silicon
devices
acclaimed
output
threat
operation
for
stage
to
solid
special
prevents
of the
performance.
security
use
the
against
the
fuses.
these
left
AC
instructions
and right
are
the
kit
without
advanced
an
high
service,
in
cases
for
special
use;
a
power
efficient
fidelity
special
it
where
panel
transformer
engineering geared
no-frills
transformer
conservative
all
are
-
reliability
amplifier
and
operating
evidence
simultaneously
And
this
circuit
with
comparable
bridge
of
symmetrical
throughout
in
a format
(except
which
al the
is
DH-110 preamplifier.
the
thermal
state
amplifiers.
output
protective
Basic protective
malfunction
line
fuse,
Nothing
hinders
audio
preassembled
assembly
skills
or
possible
is
and
avoids
only
applications
for
standard
B +
so that
one
The
stage
allows
circuits
damage
fuses,
the
to
assemble
modules
(printed
and
it
can
know-how.
to
operate
the
need
channel
include provision
19"
rack
for
international
to
approach,
Hafler
affordable.
rectifier;
levels
the
design
wit[
is
convertible
push-pull
input),
directly
Its
unique
runaway
ruggedness
the
which
could
systems
to
the
thermal
essential
the
DH
pretested.
be
done
Because
on
one
to
return
is
at fault.
mounting;
the
audio
is
making
of
efforts
state
stability
circuit,
incor-
related
which
DH-220
com-
provide
amplifier
breikers,
purity
-220
circuit
in
only
of
channel
the
Ae
perfec-
high
the
the
of
to
to
self-
is
and
to
of
kit
and
This
a
the
if
en-
for
and
fine
O
Copyright
1984,
All
rights
CONTENTS
reserved.
The
DH-220
applications,
switching
your
for
switching),
that
on
any
Likewise,
If
should
the
of the
minimizes
of most
control
the
amplifier's
turn
case,
a few
seconds
unnecessary
switch the
the
amplifier is
first check its
cartridge from
DH-220.
such radiation,
is most
since its
audio
unit does not
7
amp needs (plus
you
should
on the
ofter the
turn-on
to
the
Although
likely
to
power
preamplifiers,
provide
the
use
preamplifier
preamp
transients
power
amplifier
installed
be
position
field
for
radiated
the
certain
be installed
may
be
like
switching
other
amplifier's
first; then
has
been turned
from
close to
freedom
by
design
cartridges
out
controlled
the
Hafler
capacity
equipment
power
own
turn
some
off
first.
record
a
from hum
power
the
of the
are more
INSTALIATION
of
sight
in most
by the
DH-l10.
sufficient
it
is
switch.
the
amplifier
on, to
avoid
preamplifiers.
player,
pickup
transformer
transformer
sensitive
than
AC
If
a comparatively
tone
ing
also
In
Unobstructed
oboue the
put
top
you
by
feet,
underneath
through
ventilation
OPERATION
others,
arm
will
Be
sure
anything
and the
It is
expected
which
and require
throughout
eliminate
provide
to
air
amplifier
on top
heat
that
should
is
not
panel,
a
provided
is
separation
high
volume
its
arc. Often
problem.
the
sufficient
circulotion
is
important
of the
sinks to
the
amplifier
be
on a hard
obstructed.
the
feet may
through
setting,
around
cover
become
be removed
the
from
and while
few inches
a
uentilation
the
finned
for long,
trouble-free
perforations.
warm
in
will
always
enough
If it
the
surface
is mounted
bottom
amplifier.
swinging the
additional
for
the
heat
It is normal
use.
be resting
that
in
long
so
openings.
Check at
amplifier.
sinks
life.
air flow
rack,
a
as
adequate
spac-
and
Never
for the
on
its
or
The red
glows
is the most likely
is
switched on.
The
the
lamp
pilot
whenever the
pilot
lamp
*blinks
eVent
on
unlikel"y
mal'breakers has
temperature
few minutes, the
a
the lamp
If
excessive input
signal content
amplifier
heat
sinks,
the
amplifier to
rise
again blinks,
(such
may have
it is highly
Loudspeaker
The DII-220
the
speaker lines.
must
exist for a few
protect
most
curs.
Smaller fuses tend
adequately
not
pair
A
speaker
output
of the
values may
power
levels
If the
manufacturer
value
of fuse
fuses
3AG
power
speaker
of
5 amp fuses
fuse holders.
amplifier
be
used
into
for
of that
lamp
which is
amplifier is turned
cause if it is not
provides
also
that
the
amplifier
and off
shut
in
a
steadily, it
down
heat
sink.
amplifier
check for insufficient
signal, or
an input
as oscillation).
malfunctioned.
unlikely
overheat.
Fuse
Selection
amplifier
Experience
seconds
systems,
to
protect.most
are
These
is to
be
if the
amplifier
4
ohm loads.
your
of
protection,
their
value
and install
integral
high
a
the
amplifier
with the
on.
illuminated
temperature
ceases
indicates
A
blown AC line
when the
to
function,
that
because
When the heat
return
should
to normal
ventilation,
which
may have
Failing
that
any
is
supplied with
has
shown that
for
a fuse to
and only
blow
too
speaker
also
supplied
should
tested,
is to
speakers recommends
we
evidence of this,
Because
normal
blow,
blow
easily,
and larger
systems.
as
alternatives
be
substituted
these
and
be operated
suggest that
them
in the
of the
since
a2
when overload
power
switch
fuse
amplifier
indication.
and
one
the
of
ther-
of
excessive
has
dissipated
operation.
or
dangerous
very large
signal will
2
cause
amp fuses
overload
an
amp fuse
fuses
for the
power
if the
or intermediate
very high
at
a specific
you
obtain
panel.
back
the
an
the
will
oc-
do
l,oudspeaker
There
loudspeakers.
power"
In
in
minimal
amplifiers
must
take
you
like,
speaker
are no
As
ratings,
help
which
into
provide
to
choice,
Power
u.S.
Ratings
standards
a result,
or
suggested
in
determining
can
deliver
consideration
long
term
when you
for rating
the
manufacturers'
amplifier
safe operating
substantial
the
type
trouble-free
have
a
sizeable
power
the
limits,
amounts
of
music,
operation
handling
usual
are
levels
power.
of
and the
amplifier
"music
of only
with
You
levels
your
of
like
the
of
DH-220.
Connections
AC
The
on the
least
be left
may
in
off
If
alternate
line
described
power
AC
switched
7
amps,
or
840
on,
and
it
will
plugged
be
independently.
your
line
(mains)
power
voltages,
later
and
in
cord
should
outlet
of
watts.
be
controlled
into
a 120
voltage
transformer
be
sure
this
manual
plugged
be
preamplifier
a
Then
the
amplifier
by the
volt wall
is
different,
which
it
is
wired
before you plug
into
which
rest
outlet,
and
be
can
accommodate
your
for
120
power
of the
switched
sure
mains
in the
volts,
provide
can
switch may
system.
you
voltage
o^plifirr.
60 Hz,
on
have
several
at
Or, it
and
the
as
Input
Conventional
your
preamplifier,
panel
back
tion
is
secure,
permit
remote
by the
output
less,
as with
stance,
cable
shielded
provide
of
the
DH-220.
to
avoid hum.
location
impedance
the
DH-l0l
lengths
cables,
the
input
Be
sure that
The
length
of the
amplifier,
of the preamplifier.
and
DH-l10
to
up
50
feet
such
as those
signal
the
of these
if
desired)
Hafler preamps,
premissible
are
to
the
outer
If
supplied
sockets
shield
cables
is
it is
600
without
connec-
(so
limited
ohms
on
for
loss
with
the
as to
only
or
in-
of
A
soldering
more
likely
potential
heat
not
wait
long
time
it
is
switched
Pencil
irons
waiting
kit
always
Proper
l.
2.
3.
4.
time
building.
unplug
Soldering
There
are
Make
a
tion
while
Heat
theiunction
shiny
top
After
heating
tion.
It
should
both
surfaces.
Allow
the
Remember
mechanically
wire
is looped
to
wire
on the
Good
operation.
joint,
because
are hot
be
add
difficult
a bigger
just
to
solder
the
heat
used
a small
to
the
prefer
the
holes
free
around
on the
bright
parts
transfer
should
must
is
vide
around
"gun"
to
damage
and
unbalanced
enough
on,
are
much
when
solder
Make
sure you
it
when you
four
steps
good
mechanical
heat
and
of
of
the
iron.
for
a
melt
connection
that
the
attaching
through
place
it
through
hold
it
while
circuit
board
connections
good
A
conductors.
as
it
is
useless.
the
solder
enough.
easily
to
frequently
amount
"wet"
heat,
contact
surface
conductors,
is not
recommended.
the
etched
for
it
to
reach
poor
solder
lighter
connections
have
take
to
making
connection
solder
the
wire
couple
seconds,
immediately
to
cool
connection
the
wire
the
lug
the
soldering.
are
are
joint
solder
Never
good
A
flows
The
iron
junction.
the
to
wipe
of
solder
the
tip
with
to
any
movement
circuit
weight.
operating
connections
and
easier
a holder
a break.
a
is
applied.
and
lug,or
and
undisturbed.
is
made
to
the
and
crimped
hole
and rely
Conneclions
handled
ess ential
does
"butter"
connection
into
must
have
That's
the
to
the
a
smali
joint.
the
boards
Also,
to
follow
good
to
apply
flow
terminal.
this
for
not
partially
every
why
tip,
and
tip,
blob
Once
must
The
unfamiliar
with
because
temperature
are
use,
and there
in
sequence,
for
it,
solder
hold
the
hole,
with
solder
smoothly
by the
solder,
place,
in
on
the
to
way.
trouble-free
require
much
melted
looks
crevice
a
bright,
the
damp
occasionaliy
too.
If
a
of
solder
the
solder
be
avoided
user
its
higher
he
may
each
more
likely.
is
-though,
as
and
connection:
wire
posi-
in
the
bright,
junc-
to
the
around
not
Usually
but
iome
stiffness
the
numbered
noiseÂsolder
solder
smooth
when
shiny
and
the
tip
ipong.
you
conne.lion
pro-
to
flbws
for
by
of
to
no
a
is
in
few
seconds
nection
not
a
the
by
shiny,
connection
iron,
ALL
Never
work.
Silver
ed
solder,
recommend
which
is
general
The
heat
a
connection,
Remove
cooler
iron
components,
break
in
the
piece
small
solder
on
When
soldering
wire
from
some
bare
filled
with
is
suggested
hinders
every
has
solder
through,
from
from
board.
first
both
the
your
hole
been
fills
and
"Tinning"
solder
to
the
and
also
makes
with
the
iron
excess
wire
wire
is
to
is
uniformly
supplied
pre-tinned.
to
wiggling
re-heat
by heating
which
SOLDER
use
acid
solder
always
60/
harder
the
solder
applied
or
etched
of
the
tip
the
wire
solder
so that
inserting
first
"tinned,"
the
then
sides.
wire,
refers
bared
for
flow
with
the
the
is
then
core
is
also
obtain
for
to
melt.
good
a
wire.
joint.
wiped
USED
solder
a fresh
easiest
allow
40
procedure
then
add
once
for
a longer
lift
the
copper
circuit
wire
across
of
the
iron,
to
numbered
a
components
exposed
for
a
you
so that
secure
can
the
with
touch
a
no
hole,
but
back
it
Make
certain
across
the
to
the process
wire
end.
good
a
connection
a
couple
of
away
onto
bright,
and
this
kit
does
bond.
If in
Excess
it
and
allowing
on
MUST
or
not
suitable.
use.
is
to
use
solder
it
flows,
circuit
can
be
it.
Do
or
it
side,
you
bond.
heat
wire.
of
the
additional
good
it
is
up
a
bit,
a
hole,
onto
This
seconds,
the
iron.
no
larger
not
When
doubt,
solder
the
BE
any
separate
Ilin
supply
Do
not
a hot
with
and
time
is
pattern
mended
not
may
fall
hole
and
can
A round
and
clear
Some
iron
and
solder
practice
to
be
bright,
the
of
applying
keeps
easiet.
and
When
than
normally
cool,
check
or
if
the
may
be removed
the
solder
sponge.
ROSIN
CORE.
flux
doubt
about
of rosin
then
more
confuse
iron
the
iron
remove
core
for
likely
a short
still
from
by
simply
allow
-rlfr
into
adjacent
on
the
board,
apply
the
see
lhat
the
wooden
the
hole
builders
prefer
toothpick.
may
be
push
to
sure
solder
shiny
flow
circuit pattern
light
a
ul tfr"
strands
Simply
touch
appli
solder.
froperly
Uefore.
need
the
connection
to
flow
in
electronic
unmark-
solder.
it
with
40/
time
in
contact.
the
iron.
to
damage
the
boards.
soldering
build-up
circuitry.
insert
iron,
leaving
hole
is
toothpick
of
soldei
to
clear
If the
necessary
the
fills
the
is
evident
on
coating
secuied,
the
wire
Allow
done,
i'tre
hookup
tinning,
for
con-
from
onto
We
the
then
if
wire
wire
hole
the
of
the
the
is
G0,
to
A
A
a
of
it
if
it
r
If
any
components
torial
diagram
process
the
and
help.
tent
overall
check
To
the
end. The wire
pictorial
The
for
clarity,
view
off
on the
"prepare"
of that
coil
for verification
wire-strippers
#18,
wire when
use wire
kit
and
"bonded
is
the
line
you
strippers)
with resistance
Whenever
so
state,
be soldered to the
($3),
etc. If
yet
to
the
connection
.
kit
will be
nection,
possibility
the
minals
Be
minals
The
point.
locating
When the
together,
a connection
or
indicate
soldering is
be made to
soldered
it is
best
are
very
that
sure
or the
chassis metalwork.
symbol
When
a
reference.
instructions
the
length
uniform twist
you
find the
needed
Handle the
part
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wires
length.
circuit boards
kit
be
checked when
are
separated.
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color,
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of
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lug number
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#16.
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off
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complete.
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specified
call
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three
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turns
loosening
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components,
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install
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to
them.
checking
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distorted
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work.
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each
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of
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you
so
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wire
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use,
and it is
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If more
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connections
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Every
connection
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lead
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wire
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length
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instructions
one
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soldering
to
minimize
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appearance.
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or
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a fairly tight,
inches.
gain
will
transistors,
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be
the
list,
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single
wish
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wire
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to
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the
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the
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sequence
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When you
transformer,
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shipment.
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against
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recommend
everything,
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comparing
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carton
separated.
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lockwasher).
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size of the
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size
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matters
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the
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shown
the
wires
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the
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point
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capacitors,
when
parts
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check-off to
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enable
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#4
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output
below,
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each terminal
when
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Assembly
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fastened
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in the
you
kit,
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check off the
back
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to
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screw
install
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of the
chassis.
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identification.
feet,
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sets
screw through
install
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two
of the
chassis. Before you
the
shaft.
easier
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the hole
is tightened.
before the
are tight,
the
amplifier
screwdriver,
nut
will
output
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chassis
of the
be
sure
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the
cap
any
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lockwasher
specified,
largest.
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the
#6
of
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Install
center holes
to
expose the
Connection
holes
will
keep
Each
connecting
last
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completed.
driver,
find
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assemblies
for
this
hardware
components
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you
unfamiliar
diagram.
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side
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use
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screw
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outside
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positioned
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to
set
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safe
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insert
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lug
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of
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at
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which has
specification.
elements
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tinue to
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ing
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lockwashers
screw first.
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perform
make
a check
step.
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left
you
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circuitry
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to the
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properly
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entire
mark
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the
sheet
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contained
tested
to
assure that
the
interconnection
builder.
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the time
sure that
of
supplied
and the lockwasher
metal
your
factory
a
years
for
step has
space
been
provided,
as a convenience.
screws have
completed
assembled
to
come.
on the
PC-19
it
meets
power
of
to
be
accurate
amplifier
unit,
and
Check
completed
and
continuing
goes
always
hex heads, you
can
your
before
These
onto the
board,
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supply
and
will
con-
work,
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on to
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may
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n
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either
shaft holes
each nut
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red
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terminals
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the
lugs
and install
and RB.
point
them
Be
sure
downward,
on
the
and
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