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 aclipping indicator and utilizes an exclusive BGW
circuit. Whenever either channel of the 150 is driven into clipping, acorresponding
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 aclean, 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 acircuit employing integrated circuit to
provide an audio level indication of 0.5% and 50% of maximum power output. They
provide avaluable 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 acommon
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 awide 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.
