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“Baby Will” Valve unior Conversion Version 4
Build Manual 22 September 2009
5 of 36
Table of ontents
1 Introduction 2
2 Electrical Shock Warning 4
3 Disclaimer of Liability 4
4 Project Overview 6
4 1 Here’s what you’ll need: 6
4 1 1 Parts: 6
4 1 2 Tools: 6
4 1 3 Supplies: 6
5 Let’s get started… 7
5 1 Remove the EVJ chassis 7
5 2 Remove the EVJ’s Stock Components 8
5 2 1 Remove the Tubes and Tube Retainers 8
5 2 2 Remove the Output Transformer 8
5 2 3 Clean Up the Power Transformer 10
5 2 4 Remove the Volume Potentiometer 11
5 2 5 Remove the Stock EVJ Circuit Board 11
6 Prepare the Chassis 13
6 1 Layout and Drill 13
6 1 1 Layout the Drill Plans 13
6 1 2 Drilling the Chassis 14
7 The Baby Will 16
7 1 Assemble the Baby Will Circuit Board 16
7 1 1 Tube Sockets 16
7 1 2 PCB Standoffs 17
7 1 3 The Power Grid 17
7 1 4 Signal Path and Cathode Resistors 19
7 1 5 Sag Resistor 19
7 1 6 Signal Path and Cathode Capacitors 20
7 1 7 Hum Balance 20
7 1 8 Filter Capacitors and Ground Wire 21
7 1 9 Jumper Wires 21
7 1 10 Input Jack Hookup 22
7 1 11 Volume and Tone Controls 25
8 Putting it All Together 26
8 1 Install the New Components 26
8 1 1 The New Output Transformer 26
8 1 2 The Baby Will PCB and Tube Hardware 28
8 1 3 Hookup the Leads to the Baby Will 29
9 Turn on the Power 31
9 1 Check Your Work 31
9 1 1 Take a Break 31
9 1 2 Visual Inspection 31
9 2 Power Up without Tubes 32
9 2 1 The First Power Up 32
9 3 Power Up with Tubes 33
9 3 Power Up with Tubes 34
9 3 1 The Real Test 34
11 Finish Things Up 35
11 Finish Things Up 36
11 1 Re-Assemble the Amp 36
