Adcom GFA-555 Pro - Design and Maintenance; Design Philosophy; Care and Cleaning

SECTION 6
WHY
WE
BUILT
IT
THE
WAY
WE
DID
The
ADCOM
GFA-555
represents
a
departure
from
many
of
the
other
amplifier
designs
currently
available.
Thistleparture
is
the
result
of
a
careful
study
of
all
known
amplifier
technology,
circuits
and
parts.
The
main
feature
of
the
GFA-555
is
its
outstanding
ability
to
drive
the
vast
majority
of
speakers
to
high
sound
levels
while
maintaining
the sonic integrity of the music.
The
Instantaneous
Distortion
Alert
is
a
unique
distortion
detection
circuit
which
reads
all
forms
of
distortion
—
THD,
IM,
Slew
Induced,
and
DC-Offset.
Peak
LEDs,
one
per
channel,
will
glow
when
distortion
is
above
1%
regardless
of
the
load
impedance
or
reactance.
In
use,
the
LEDs
may
occasionally
flicker
under
high
volume
listening.
If
they
glow
brightly
or
are
on
most
of
the
time
that
you
are
listening,
you
are
over-driving
your
equipment
and
should
turn
down your volume control.
We
consider
the
GFA-555
to
be
a
truly
significant
contribution
to
the
advancement
of
sound
technology.
To
ensure
that
the
quality
of
construction
is
on
par
with
the
quality
of
the
sonics,
(a
much
neglected
area
in
many
other
amplifiers)
the
GFA-555
has
been
carefully
developed
with
computer
controlled
metal
fabrication
techniques
that
maintain
0.005
of
an
inch
tolerances
throughout.
Full
electrical
inspection
of
each
and
every
circuit
board,
subassembly,
as
well
as
the
finished
amplifier,
provide
a
mechanically
and
sonically
superior
product
for
your
enjoyment.
At
the
time
of
its
design,
we
know
of
no
other
product
on
the
market
which
offered
the
design
and
construction
quality
of
the
GFA-555
at
anything
close
to
its
selling
price.
We
sincerely
hope
that
you'll
agree.
SECTION 7
THE
CARE
AND
FEEDING
OF
YOUR
GFA-555
Great
care
has
been
taken
by
ADCOM
to
assure
that
your
amplifier
is
as
flawless
in
appearance
as
it
is
electronically.
The
front
panel
is
heavy
gauge,
high-grade
anodized
aluminum.
If
the
front
panel
should
become
fingerprinted
or
smeared,
it
can
be
cleaned
with
a
damp,
soft
cloth.
UNDER
NO
CIRCUMSTANCES
SHOULD
A
STRONG
OR
ABRASIVE
CLEANER
SUCH
AS
SCOURING
POWDER
OR
OVEN
CLEANER
BE
USED
ON
ANY
PART
OF
THE
AMPLIFIER.
The
amplifier
is
protected
by
a
line
fuse
on
the
rear
panel.
If
the
power
is
switched
ON
and
the
small
red
LED
on
the
front
panel
does
not
illuminate
after
a
few
seconds,
shut
off
the
amplifier,
unplug
the
AC
line
cord
from
the
power
outlet,
and
check
the
AC
line
fuse.
If
the
fuse
has
opened,
replace
it
ONLY
with
a
fuse
of
equal
value.