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SR105
Power
Amplifier
DESCRIPTION
(Shown
in
A105A
Carrying
Case)
The Shure SR105 Power Amplifier is a high-power ampli-
fier designed for sound reinforcement applications. It is
capsble of delivering 200 watts rms to a 4-ohm load, and is
available in two models, the SR105A and SR105B. The
SRlO5A Power Amplifier provides both a direct-coupled
speaker output and a transformer-coupled constant-volt-
age, 70-volt output, while the
SR105B Power Amplifier is
equipped with a direct-coupled speaker output only. In
this manual "Amplifier" refers to both
SRI05A and SRlOSB
models unless otherwise specified.
The Amplifier is of rugged construction and is conserva-
tively designed to provide reliable operation at high power
levels with minimum distortion and phase shift. Used in
conjunction with a suitable mixer-preamplifier or audio
console such as the Shure Model
SR101, a versatile, high-
quality, high-power, sound reinforcement system may be
assembled for use with a variety of speaker systems. Sev-
eral
SR105 Power Amplifiers may be interconnected (de-
scribed under Operating Instructions) to provide greater
power output for large installations and redundant opera-
tion. The basic direct-coupled speaker output capabilities
of the Amplifier are well suited to the source-oriented
speaker systems used in theatres, auditoriums, stadiums,
ballrooms, and convention halls, in short, wherever maxi-
mum coverage with reserve power is required. The addi-
tional 70-volt output feature of the
SR105A Power Amplifier
makes it equally adaptable to source-oriented or distrib-
uted speaker systems such as those used for background
music or announcements in industrial buildings, institutions
or public places.
An Output Voltage Meter in the Amplifier facilitates ad-
justment and output level monitoring.
Silicon transistors and similar solid-state devices are
used throughout the Amplifier. Short-circuit and thermal
overload protection are design features which eliminate
the need for special installation or operation precautions.
All components are of the highest quality and are operated
well within their respective ratings to assure maximum
reliability under normal use conditions.
The Shure
SR105 Power Amplifier is supplied with one
1.8m
(6
ft) audio input connecting cable and an acces-
sory package consisting of four rack-mounting screws, one
Volume Control Cover, one Power On-Off Switch Cover, and
one spare 5-ampere fuse.
The
SR105A and SRIO5B Power Amplifiers are listed by
Underwriters' Laboratories, Inc., and are listed by Canadian
Standards Association as certified.
The
A105A Portable Carrying Case accessory is de-
signed specifically for use with the
SR105 Power Amplifier.