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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 2 2 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*
. . .
. I 5 0 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
onl y .
"Model
SR105B
onl y .
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