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SR105
Power Amplifier
SPECIFICATIONS
The following specifications apply to both SR105A and SR105B Power Amplifiers except where noted. The SR105A Power
Amplifier provides both direct-coupled speaker output and transformer-coupled, constant-voltage, 70-volt output. The
SRlO5B Power Amplifier is equipped for direct-coupled speaker output only.
.......
Amplifier Type All silicon transistor power
amplifier
Power Output
.......
.200 watts rms continuous to
4-ohm load
100 watts rms continuous to
8-ohm load
150 watts rms continuous to
70-volt line (33-ohm load)*
Voltage Gain
.........
27 22 dB (4-ohm load at 1 kHz)
35
e3.5 dB (33-ohm load at 1 kHz
across 70-volt output)'
Sensitivity
...........
1.2 volts nominal (full rated output)
Frequency Response
.
.
&I
.5 dB, 20-20,000 Hz (typical)
*2 dB, 50-15,000 Hz (typical,
70-volt output)"
Input Impedance
....
.39 kilohms &30%, balanced or
unbalanced*
25 kilohms
&30%, balanced or
unbalanced*
*
Total Harmonic
Distortion
........
.2% max. at 1 kHz, 200W (4-ohm
load, 28.3 Vrms output)
3% max. at 1 kHz,
150W (33-ohm
load, 70.7 Vrms output)*
Hum and Noise
......
.80 dB below rated output (less than
2.8
mV at direct-coupled speaker
output with Volume Control at
0)
Output Clipping Level.
.
28.3 Vrms min. at 1 kHz (4-ohm
load)
Load lmpedance:
Direct-Coupled
Speaker Output
.
.4 ohms or greater (4 ohms min.)
70-Volt Output*
...
.I50 watts max. (33 ohms min.)
Load Regulation:
Di rect-Coupled
Speaker Output
. .
Less than 1 dB from no-load to 4-
ohm load at 200 watts rms out-
put
....
70-Volt Output*
Less than 2 dB from no-load to
33-
ohm load at 150 watts rms out-
put
Phasing..
...........
Pin
3
and phone jack tips of in-
puts in phase with speaker out-
put phone jack tips, and 28V
and 70V terminals
Power Supply
........
120 volts, 50/60 Hz ac only. Power
consumption: 40 watts max. (20
watts typical) with no signal, 450
watts with
1
kHz signal and 200
watts output; 500 watts maximum
Temperature Range:
Operating
.........
-7' to 43OC (20' to 1 10°F)
Storage
...........
-34' to 74OC (-30' to 165OF)
Dimensions
.........
.I78 mm x 483 mm x 270 mm
(7 in. H x 19 in.
W
x 10% in.
D)
Weight:
SR105A
...........
15.66 kg (34 Ib
8
oz)
SR105B
...........
12.23 kg (27 Ib)
Finish
..............
Matte black
Installation
..........
Equipped for standard 19" (483
mm) rack mounting; may be op-
erated in optional
A105A Carry-
ing Case
Certifications
........
Listed by Underwriters' Labora-
tories, Inc.; listed by Canadian
Standards Association as certi-
fied
Model
SR105A
only.
"Model
SR105B
only.