Shure sr 105 service manual
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Extracted text from shure sr 105 service manual (Ocr-read)
Page 1
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.
Page 2
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