Quad Electroacoustics QUAD 405 - Table of Contents

Contents
Circuit Description
Test Equipment
Disconnecting Clamp Circuits
Amplifier Circuit Testing
Clamp Circuit Testing
Fault Finding
Modifications
Clamp Circuit
Replacing a Clamp Board
Conversion of a 405 to a Mono 180 watt amplifier
Replacing Transformer
Replacing Amplifier Modules
Π405-2
Assembly Diagram
page
3
4
4
5
5
6
8
9
9
10
11
11
12
13
2
Circuit Diagram M12333 iss. 2 - Amplifier PCB M12368 iss. 5 & 6 14
Circuit Diagram M12333 iss. 3 - Amplifier PCB M12368 iss. 7 15
Circuit Diagram M12333 iss. 4 - Amplifier PCB M12368 iss. 9 16
Circuit Diagram M12333 iss. 5 - Amplifier PCB M12368 iss. 9 & 10 17
Amplifier Board layout M12368 iss. 9 & 10 18
Circuit Diagram M12333 iss. 6 - Amplifier PCB M12565 iss. 3 19
Amplifier Board layout M12565 iss. 3 20
Circuit Diagram M12333 iss. 7 - Amplifier PCB M12565 iss. 5 21
Circuit Diagram M12333 iss. 8 - Amplifier PCB M12565 iss. 6 22
Circuit Diagram M12333 iss. 9 - Amplifier PCB M12565 iss. 7 23
Circuit Diagram M12333 iss. 10 - Amplifier PCB M12565 iss. 7 24
Keith Snook modifications Click here