BGW 250 - Product Description

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I-DESCRIPTION:
The BGW 250 is the most advanced dual solid state power
amplifier available. The basic design criteria used are
those which are applied to present day computers and related
equipment.
Unique design features incorporated in the 250 make it
virtually "FAIL SAFE" and free from accidental damage caused
by human error in audio service.
A fast acting SCR (silicon controlled rectifier) crow bar
is employed as a safe guard for your speakers. The sophisti-
cated sensing circuitry for the crow bar constantly samples
the individual outputs of each channel. The outputs of each
channel are integrated and passed through an absolute value
detector. The output of the detector is connected to a compar-
ator which is activated by the presence of a large DC component.
If such a voltage is present the comparator in turn triggers a
fast discharge pulse circuit which fires the SCR crow bar. The
crow bar is essentially a direct short placed across the two
power supplies- If activated this causes abnormally high
current to flow in the primary circuit and within a fraction
of a second the ultra fast acting circuit breaker disconnects
the power. The crow bar circuit quickly discharges all energy
stored in the power supply internally, not into the speaker;
thus protecting the load.
The packaging inside your 250 is unlike ordinary power
amplifiers. Each channel assembly is on its own separate
module, which simply plugs in or out for quick and easy
service. Each of these units is constructed on a tremendous
aluminum extrusion. The total radiating surface area of
each heat sink is 330 square inches. The heat sinks have
mating circuit boards which carry the passive components.
Each unit's wiring is identical with the next as the circuits
are photo etched. The heat sinks plug in with an 8 pin
connector.