Specifications

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Tweed 5E3 PCB Valve Junior Conversion
Build Manual v3.0 13 Feb 2011
5 of 40
Table of Contents
1.! Introduction ................................................................................................................. 2!
............................................................................................................................................. 3!
2.! Electrical Shock Warning ........................................................................................... 3!
............................................................................................................................................. 4!
3.! Disclaimer of Liability ................................................................................................ 4!
4.! Project Overview ........................................................................................................ 7!
4.1! +HUH¶VZKDW\RX¶OOQHHG ...................................................................................... 7!
4.1.1! Parts: ............................................................................................................. 7!
4.1.2! Tools: ............................................................................................................ 7!
4.1.3! Supplies: ........................................................................................................ 7!
5.! /HW¶VJHWVWDUWHG« ....................................................................................................... 8!
5.1! Remove the EVJ chassis ...................................................................................... 8!
5.2! 5HPRYHWKH(9-¶V6WRFN&RPSRQHQWV ................................................................ 9!
5.2.1! Remove the Tubes and Tube Retainers ........................................................ 9!
5.2.2! Remove the Output Transformer from the Chassis ...................................... 9!
5.2.3! Clean up the Power Transformer ................................................................ 11!
5.2.4! Remove the Volume Potentiometer ............................................................ 12!
5.2.5! Remove the Stock EVJ Circuit Board ........................................................ 12!
6.! Prepare the Chassis ................................................................................................... 14!
6.1! Layout and Drill ................................................................................................. 14!
6.1.1! Layout the Tweed 5E3 PCB for Drilling .................................................... 14!
6.1.2! Layout the Faceplate for drilling ................................................................. 15!
6.1.3! Drilling the Chassis base ............................................................................. 16!
7.! Tweed 5E3 PCB ........................................................................................................ 18!
7.1! Assemble the Tweed 5E3 PCB .......................................................................... 18!
7.1.1! PCB Standoffs ............................................................................................. 19!
7.1.2! Tube Sockets ............................................................................................... 19!
7.1.3! Spade Connectors........................................................................................ 21!
7.1.4! Diodes ......................................................................................................... 21!
7.1.5! 7KH³&DVFDGH3UHDPS´RSWLRQ .................................................................... 22!
7.1.6! The Jumpers ................................................................................................ 22!
7.1.8! Filter Capacitors .......................................................................................... 22!
7.1.9! Bypass Capacitors ....................................................................................... 24!
7.1.10! Install the Remaining Components ............................................................. 25!
7.1.11! Input Jack complex ..................................................................................... 27!
7.1.12! Tone & Volume Potentiometers ................................................................. 28!
7.1.13! Connect the Control Leads.......................................................................... 29!
8.! Putting it all together ................................................................................................. 30!
8.1! Install the New Components .............................................................................. 30!
8.1.1! Hookup the Tweed 5E3 PCB ...................................................................... 30!
8.1.2 The New Output Transformer .......................................................................... 32!
8.1.3 The Power Supply connections ........................................................................ 34!