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SR105
Power Amplifier
TABLE OF CONTENTS
Section Page
...............................
SPECIFICATIONS ii
DESCRIPTION
..................................
1
OPERATING INSTRUCTIONS
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Functional Identification 3
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General Operating Instructions
3
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Mounting and Ventilation 4
Thermal Overload
.............................
4
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Power Requirements 4
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Functional Circuit Description 4
Input Connections
.............................
4
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Output Connections 6
Amplifier-to-Speaker Impedance Matching
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8
Output Voltage Meter
...........................
9
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Basic Operating Hints 10
SPECIAL OPERATING INSTRUCTIONS
Adding
SRlO5A Amplifiers in a
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70-Volt System (Cascaded) 10
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Bridging Connections 11
Adding Headphone Jack to Speaker Connections
...
11
SERVICE INSTRUCTIONS
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Amplifier Service 12
Section Page
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Replacement Parts 12
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Fuse Replacement 12
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Bottom Plate Removal 12
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Cover Removal 12
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Lamp Replacement 12
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Dc Output Balance Adjustment 12
Output Voltage Meter Calibration
.................
12
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Printed Circuit Board Removal 13
Small Signal and Predriver Transistors
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14
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Driver Transistors 14
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Output Transistors 15
Diodes
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15
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Diode Bridge Rectifier 15
Checking Transistors and Diodes
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15
SR105B Amplifier Conversion for 70-Volt Output
....
15
Service lllustrations
............................
17
Guarantee
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17
Shipping Instructions
...........................
17
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PARTS LIST 19
CONDENSED OPERATING INSTRUCTIONS
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27
ARCHITECTS' AND
ENGINEERS' SPECIFICATIONS
...............
27
SR105
Power Amplifier
LlST OF ILLUSTRATIONS
Figure Page
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1 SR105 Power Amplifier Front Panel 2
2 SR105 Power Amplifier Rear Panel
...........
2
3
SR105 Power Amplifier Dimensional
.........................
Outline Drawing 4
4
SR105 Power Amplifier Block Diagram
........
5
5 Input Connections
.........................
6
6
Output Power vs
.
Load lmpedance from
2 Ohms to 32 Ohms
......................
7
7
70-Volt Output Power vs
.
Direct Output Load
Impedance from
4
Ohms to 100 Ohms
.......
7
8
Recommended Wire Gauge vs
.
Amplifier-to-
Speaker Distance: Direct Output
...........
8
9
Recommended Wire Gauge vs
.
Amplifier-to-
Speaker Distance: 70-Volt Output
(SR105A Only)
..........................
8
Figure Page
10 70-Volt System Attenuator
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11
11
Bridged Amplifier Connections
...............
11
12 Headphone Jack for Speaker Connections
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11
13
SR105 Power Amplifier Top View, Cover
Removed
(SR105A Model Shown)
..........
13
14
SR105 Power Amplifier Bottom View.
Cover Removed
(SR105A Model Shown)
.....
14
15
70-Volt Conversion: Added Circuitry
..........
16
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16 70-Volt Conversion: Transformer Mounting 17
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17 70-Volt Conversion: Internal Wiring 18
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18 Main Circuit Board Parts Location Diagram 22
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19 Filter Circuit Board Parts Location Diagram 22
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20 Transistor Lead Codes 23
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21 SR105 Power Amplifier Circuit Diagram 25