UNIVERSAL AUDIO Model 175 B LIMITING AMPLIFIER
1
OPERATING INSTRUCTIONS
UNIVERSAL AUDIO INC.
Model 175 B
LIMITING AMPLIFIER
The Universal Model 175 B is an extremely versatile professional quality peak
limiting amplifier designed for use in the recording, broadcasting and motion
picture industries as well as other high quality audio systems. The 175 B is a
true limiting amplifier capable of high gain, low distortion, linear amplification
at levels below the threshold of limiting and with excellent limiting
characteristics and negligible increase in distortion at levels above.
The model 175 B is designed to be mounted in a standard 19” rack. The unit
requires only 3½” of rack space, and the front panel is hinged to provide
accessibility to the inner components. The highest quality military type printed
circuitry is combined with 1% precision resistors and over rated components
throughout to insure maximum performance and reliability. Plug-in type “FP”
electrolytic capacitors are used for ease of replacement.
The 175 B has a self contained power supply, a VU meter that is switchable to
indicate input or output level as well as gain reduction in dB, and input and
output attenuators graduated in 2 dB steps, with vernier adjustments in excess
of 2dB for each step.
The limiter is provided with input and output jacks on the front panel as well as
a terminal strip on the rear of the unit for interconnecting the amplifier with a
system. The terminal strip also provides for connecting a remote VU meter if
desired.
Separate adjustments of the attack and release times are provided on the front
panel as well as a limit defeat switch mounted on the rear of the attack control to
allow for the wide variety of program material that the 175 B will be expected to
handle. Checking the unit for balance, or rebalancing may be accomplished
without the need for test equipment, because an internal signal for balancing is
provided on the position of the test switch. Screw-driver adjustment holes are
provided on the front panel so that the VU meter may be easily observed with
the panel closed during balancing.
