Shure SR105 service manual Specifications

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

2.8mV 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.)

Model SR105A only. "Model SR105B only.

Load Regulation: Direct-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 110°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