Version 3.2 Page: 3
Table of Contents
Introduction..........................................................................................................................................5
Acknowledgements..............................................................................................................................5
WARNING ..........................................................................................................................................6
Please Read this Information Carefully .............................................................6
Version Control....................................................................................................................................7
Guitar Amplifier Basics.......................................................................................................................8
Fender and Marshall tone controls..............................................................................9
Interactive Volume Controls –Fender Tweed Amps .................................................. 12
Distortion .............................................................................................................. 14
Introduction to Vacuum Tubes and Common Terms .................................................................17
Input Jack Theory ..............................................................................................................................20
Circuit Description.............................................................................................................................21
Original Circuit with outlined stagesTweed Specifications..........................................................22
Fender amps own the blues … ........................................................................................................24
Building an Amp ................................................................................................................................26
Introduction........................................................................................................... 26
Switches and wire ................................................................................................... 26
Physical layout........................................................................................................ 26
Grounding ............................................................................................................. 26
Insulated jacks ........................................................................................................ 27
Minimizing transformer interference......................................................................... 27
Wiring ................................................................................................................... 27
Assembling the amp ..........................................................................................................................27
Before You Begin ................................................................................................... 27
Tools..................................................................................................................... 27
Soldering................................................................................................................ 28
Tube Pin Numbering .............................................................................................. 28
Assembly Steps Summary ........................................................................................ 29
Mounting Hardware Locations................................................................................. 30
Install Hardware .................................................................................................................................30
Wiring ................................................................................................................... 32
Install Power Transformer................................................................................................................34
Wiring the Tweed Rectifier Socket ................................................................35
Trinity Tweed Grounding Scheme................................................................. 35
Mains Power Connection ............................................................................36
Testing the Power Transformer................................................................................ 40
Install the Output Transformer - Output Jacks .......................................................... 40
Impedance Switch................................................................................................... 41
Assemble the Eyelet Board...............................................................................................................43
Connecting the Board ................................................................................45
Connect Board to Potentiometers .................................................................45
Input Jacks ..........................................................................................................................................47
Final checkout.....................................................................................................................................48
Working Inside A Tube Amplifier Safely................................................................... 50
Unplug ...................................................................................................50
Sit.......................................................................................................... 50
