Table Of Contents - Audio Note L2 Line Preamplifier Instruction Manual

Table of Contents

Section1: Introduction..............................................................................................................................................................4
General Information .............................................................................................................................................................4
Preparation ..........................................................................................................................................................................4
Soldering ..............................................................................................................................................................................5
De-soldering.........................................................................................................................................................................6
Section 2: Mechanical Assembly.............................................................................................................................................7
Installing the feet..................................................................................................................................................................7
Mains Transformer, Choke, and Mains Installation .............................................................................................................7
Configuring the Primary Winding for your World Region .................................................................................................9
Installing the IEC Socket (AC Socket) and Rocker Switch ............................................................................................12
Installing the Choke........................................................................................................................................................13
Installing the Mains Transformer....................................................................................................................................13
Wiring up the Mains........................................................................................................................................................14
Shield Positioning...........................................................................................................................................................15
Section 3: M2 Power Supply .................................................................................................................................................17
M2 Power Supply Board Parts List ....................................................................................................................................18
M2 Power Supply Board Construction Steps.....................................................................................................................19
Installing the Valve Bases ..............................................................................................................................................19
Installing the Resistors ...................................................................................................................................................21
Installing resistors in the HT ADJUST position ..............................................................................................................23
Zener Diode Installation .................................................................................................................................................24
Electrolytic Capacitor Installation ...................................................................................................................................25
Installing the Bridge Rectifier .........................................................................................................................................27
Installing the Non-Polarized Capacitors .........................................................................................................................27
Wiring the M2 Power Supply Board ...............................................................................................................................28
Filament Component Section of the M2 Power Supply Board.......................................................................................31
Regulator Installation......................................................................................................................................................32
Installing the LED Harness.............................................................................................................................................33
Remaining Wire Connections.........................................................................................................................................33
Installing the Heatsink ....................................................................................................................................................34
Installing the Choke Wire ...............................................................................................................................................35
Inter-wiring to the Mains Transformer ............................................................................................................................36
Securing the Regulators to the Heatsink........................................................................................................................39
Section 4: M2 Power Supply Testing ....................................................................................................................................41
Preparations.......................................................................................................................................................................41
Fitting the Mains Fuse ....................................................................................................................................................41
Installing the LED Indicator ............................................................................................................................................42
Installing the tubes .........................................................................................................................................................42
Tidying Up ......................................................................................................................................................................42
Ohm Check ........................................................................................................................................................................43
Electrical Testing................................................................................................................................................................43
Voltage Check Summary ...................................................................................................................................................45
DC Voltage Checks ........................................................................................................................................................45
AC Voltage Checks ........................................................................................................................................................45
Section 5: Install the Screen..................................................................................................................................................46
Section 6: Line Board Assembly ...........................................................................................................................................47
Line Stage Schematic ........................................................................................................................................................48
Line Board Parts List..........................................................................................................................................................49
Installing the Board Spacers ..............................................................................................................................................49
Valve Base Installation.......................................................................................................................................................49
Resistor Installation............................................................................................................................................................50
Capacitor Installation .........................................................................................................................................................51
Section 7: Wiring Up the Line Stage .....................................................................................................................................53
Filament Wiring ..................................................................................................................................................................53
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