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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.
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SR105 Power Amplifier
SPECIFICATIONS
(Curves shown are typical)
FREQUENCY (Hz1
OUTPUT POWER (WATTS)
TOTAL HARMONIC DISTORTION VS. OUTPUT POWER TO
4-OHM LOAD AT 50 HZ, 1 KHZ & 10 KHz (DIRECT OUTPUT
ONLY) OUTPUT
POWER VS. FREQUENCY AT 1% 81 2% TOTAL HAR-
MONIC DISTORTION TO 4-OHM LOAD (DIRECT OUTPUT
ONLY)
LOAD RESISTANCE, OHMS
OUTPUT POWER (WATTS)
TOTAL HARMONIC DISTORTION VS. OUTPUT POWER (VAR-
IOUS LOADS) AT 1 KHz AND CONSTANT 70.7V OUTPUT
(70V OUTPUT ONLY)*
FREQUENCY ( H J
OUTPUT POWER (WATTS)
TOTAL HARMONIC DISTORTION VS. OUTPUT POWER TO OUTPUT
POWER VS. FREQUENCY AT 1% & 2% TOTAL HAR- 150-WATT (33-OHM) LOAD AT 1 KHz FOR INCREASING OUT- MONlC DISTORTION TO 33-OHM LOAD (70V OUTPUT ONLY)*
PUT VOLTAGES (70V OUTPUT ONLY)*
'Model SRIO~A only. iii
