Trinity Amps OSD Builders Guide Ver. 1.25.docx
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Table of Contents
Table of Contents..................................................................................................................................................................................... 3
Introduction .............................................................................................................................................................................................. 7
Acknowledgements.................................................................................................................................................................................. 7
WARNING............................................................................................................................................................................................... 8
Please Read this Information Carefully..................................................................................................................................... 8
Version Control ........................................................................................................................................................................................ 9
About the OSD ...................................................................................................................................................................................... 11
Guitar Amplifier Basics......................................................................................................................................................................... 12
Dumble Tone Stack –from Merlin............................................................................................................................................... 15
General Amplifier Operation............................................................................................................................................................... 17
Some DO NOTS......................................................................................................................................................................... 17
Some DOs.......................................................................................................................................................................................... 17
Introduction to Vacuum Tubes and Common Terms .................................................................................................................... 18
Building an Amp..................................................................................................................................................................................... 21
Introduction....................................................................................................................................................................................... 21
Switches and wire.............................................................................................................................................................................. 21
Physical layout ................................................................................................................................................................................... 21
Grounding.......................................................................................................................................................................................... 21
Insulated jacks ................................................................................................................................................................................... 22
Minimizing transformer interference ............................................................................................................................................ 22
Wiring ................................................................................................................................................................................................. 22
Assembling the amp .............................................................................................................................................................................. 23
Before You Begin ............................................................................................................................................................................. 23
Tools ................................................................................................................................................................................................... 23
Soldering............................................................................................................................................................................................. 23
Tube Pin Numbering ....................................................................................................................................................................... 24
Check Your Kit....................................................................................................................................................................................... 25
OSD Build Steps Summary .................................................................................................................................................................. 25
1. Install all the Hardware ..................................................................................................................................................................... 26
2. Install Terminal Strips ....................................................................................................................................................................... 30
3. Install Terminal Strip Components ................................................................................................................................................ 35
4 Install Components on the Send Return Jacks and Bias Points ................................................................................................. 38
5 Install the ground bus ........................................................................................................................................................................ 39
6 Connect Components to the ground bus ....................................................................................................................................... 40
7 Build the RELAY board .................................................................................................................................................................... 44
8 Install the Power Transformer and Output Transformer ........................................................................................................... 47
Wire the Output Transformer .................................................................................................................................................. 47
Wire the Impedance Selector and Output Jacks.................................................................................................................... 49
9 Wiring the Power Transformer Primary Leads ............................................................................................................................. 50
120V Mains........................................................................................................................................................................................ 50
240V Mains........................................................................................................................................................................................ 51
Test the Power Transformer..................................................................................................................................................... 52
Test the Overdrive RELAY Board .......................................................................................................................................... 54
10 Build the Eyelet Board. Install it in the Chassis ......................................................................................................................... 55
Eyelet Board General Assembly Notes ........................................................................................................................................ 57
Eyelet Board Assembly .............................................................................................................................................................. 59
11 Connect Eyelet Board Ground Points.......................................................................................................................................... 66
12 Connecting the Eyelet Board to Tube Sockets ........................................................................................................................... 67
13 Connecting the Eyelet Board to the Controls ............................................................................................................................. 72
Shielded Cable.............................................................................................................................................................................. 72
