Copyright © 2018 AudioNote Kits
www.AudioNoteKits.com
Page 2
Table of Contents
Section 1 — Introduction
1.1 About ANKits ………………………………………..……………………………………………..…………………….. 6
1.2 Evolution of the L4 EL34i Integrated Amplifier
……………….…………..…….…………………….. 7
1.3 Overview …………………………………………………………………………………….….…….…………………….. 8
1.4 Basic Operation of the Amplifier ……………………………………….….………………………………….. 10
1.5 Equipment ………………………………………………………………………………………….……………………… 11
1.5.1 Overview of the Kit .………………….……………………………….…….............…………………….. 11
1.6 Tips and Suggestions ………………………….………………………………...….….……….………………….... 11
1.6.1 Soldering ……………………………....….....................................……….…………………………..... 11
1.6.2 Components ………………………………..……………………………….....….....…………….……..... 11
1.6.3 Resistor Sizes ……………………………..……...........................................................…………..... 12
1.6.4 Capacitor Voltage Ratings ………..……...........................................…………………..…....... 12
1.6.5 Electrolytic Capacitors ……………..……................................................…………………..….. 12
1.6.6 Diodes …………………………………..……................................................……………..……............ 12
1.6.7 Hardware/Mechanical …………..……........................................…….…….............………….. 13
1.6.8 Wire Stripping and Tinning …..……....................................................……………………….. 13
1.6.9 Wire Color ……………………………..……..................................................……………………….. 14
1.6.10 Optional Finishing Touches …..……..................................................……………………….. 14
1.7 Build Process …………………………………………………..……………………………………………………….... 14
1.7.1 Some Good Rules of Thumb for Building Your Headphone Amplifier ….……...... 14
1.7.2 Organization of this Manual ……………….…….………………........……….………..………….. 15
1.7.3 Electrical Safety Warning ……………….…….………………........……….………..…………..
17
Section 2 — Feet, IEC and Rocker Switch Installation
2.1 Overview ….……………………...................………….……………………………………………………………….. 18
2.2 Feet Installation ….…………..................………….……………………………………………………………….. 19
2.3 IEC and Rocker Switch Installation ………….………………………………………………………..…….. 20
Section 3 — Mains Transformer installation
3.1 Mains Transformer Installation ………….………………………………………………………………..….. 21
Section 4 — IEC PCB Installation
4.1 IEC PCB Wiring ………...……………………………………………….………………………………………….….. 23
4.2 Mounting the IEC PCB ……,.………………………………………….…………………………..…………….….. 27
4.3 Additional Mains Wire Preparation ….……………………….………………………..….………….….. 27
