BGW 150 - Product Description and Features; Front Panel LED Indicators; Grounding System Configuration; Input Connector Options

01530-1
DESCRIPTION
The BGW Model 150 is
one of the
most
advanced
solid state’, fully
complementary,
bridgeable, stereo
power amplifiers
available.
Features
of
the Model
150 include
precision
step
attenuator
level
controls, LED
metering, separate circuit
and chassis
grounds, XLR
and
K»" input
connectors with
transformer sockets,
and
small
size.
The front panel
includes two
vertical rows of
four
red
LED's,
one
row for each
channel. The
lower
LED
in
each row is
the
IDLE
indicator or
pilot lamp.
They will
be
lit
whenever
the
amplifier is
turned
on.
The top LED
in
each row is a
clipping
indicator
and utilizes
an exclusive
BGW
circuit.
Whenever
either channel of
the 150 is
driven into
clipping, a
corresponding
indicator
lights and
remains lit for
0.20
seconds.
These
indicators,
which
actually
indicate
loss of
feedback, tell
the operator
that
the
amplifier is
being
overdriven
and
can be
invaluable to the
engineer
who must be
sure that
every
component
in
his
system
is
producing a clean,
distortion-free
signal.
An
inadvertant
short-circuited
output (with signal) will
cause the LED to
remain on until
the
short
is
removed.
The middle LED's
are
connected
to a circuit
employing
integrated
circuit
to
provide an
audio level
indication
of
0.5%
and 50% of
maximum
power
output.
They
provide
a
valuable tool
for total system
evaluation
in multiple
amplifier
installations.
Both the circuit
and chassis
grounds are
connected
to separate
barrier strip
terminals
on the rear of
the amplifier.
They
are
connected
together
by a
removeable link.
By removing the
link, the
circuit
grounds
of
all
active
units
(amplifiers,
preamplifiers,
mixers, etc.)
can
be tied to
earth
ground
at
a
common
point. This aids in
eliminating ground
loops.
Either XLR-type of
K»
inch
phone
plugs may
be
used for
input
connections.
If
plug-
in transformers
are used, the
XLR-type
connectors
are
connected. If
not, jumpers
must
be employed in
the transformer
sockets.
See
sections
03011,
03021,
03031,
and 03041 for details.
The size of the
Model 150
is
convenient
for
a
wide
variety of
applications.
However, please
note
the following
precaution:
1)
Do
not
use
the
front
panel as
the sole
support
for the
amplifier.
Side rails
or
rack shelves
should
be
employed (See
section
02650).
The output stages of
your
amplifier use
the
most
advanced type of
transistors
available.
These large
geometric,
complementary,
power
devices
have
large
safe
operating areas
and extended
power
bandwidth.
Electrostatic
and other
highly
reactive speaker
systems
present no
difficulties for
the Model
150.
The aluminum
heat sinks are located so
the
150
power
amplifiers can be
stacked on top of
each
other and air can be
forced
through
both sides to
cool
the
products.