Table Of Contents - Audio Note Mono Block 300b/2A3 Instruction Manual

Table of Contents

Section1: Introduction..............................................................................................................................................................3
Chassis Orientation..............................................................................................................................................................3
Hardware and Kit Bags ........................................................................................................................................................3
General Overview ................................................................................................................................................................4
Section 2: Mechanical Section ................................................................................................................................................5
Installing the Grommets .......................................................................................................................................................5
Installing the Tang Strips .....................................................................................................................................................6
Installing the Mains Transformer .........................................................................................................................................8
Preparing the Secondary Wires...........................................................................................................................................9
Fitting the Hard-Wiring Posts .............................................................................................................................................10
Installing the Choke ...........................................................................................................................................................11
Installing the Rear 8 Pin Valve Base .................................................................................................................................12
Fitting the Heat Sink...........................................................................................................................................................12
Fitting the Filament Board Support Screw .........................................................................................................................14
Installing the Output Transformer ......................................................................................................................................14
Installing the Interstage Transformer .................................................................................................................................15
Section 3: IEC Section...........................................................................................................................................................16
Installing the IEC Inlet Plug and Mains Rocker Switch......................................................................................................16
Connecting IEC and Transformer Grounds .......................................................................................................................17
Connecting the Mains Primary to the Rocker Switch ........................................................................................................18
Finishing off the mains wiring ............................................................................................................................................19
Section 4: Completing the Power Supply ..............................................................................................................................20
Power Supply Hard-Wiring.................................................................................................................................................21
Additional Wiring for Parallel Triode Operation ..............................................................................................................30
Section 5: Building and Installing the Filament Board...........................................................................................................31
Section 6: Front Insert Plate and Remaining Wiring .............................................................................................................38
300B Valve Base Orientation.............................................................................................................................................38
Wiring the Front Plate ........................................................................................................................................................41
Filament Wire Connections to 300B and 6SH7 .................................................................................................................46
Output Transformer Primary Connections .........................................................................................................................47
Interstage Transformer Wiring ...........................................................................................................................................48
Input Signal Earth Connection ...........................................................................................................................................53
Speaker Post Installation ...................................................................................................................................................53
Tidying Up ..........................................................................................................................................................................54
Section 7: Final Checks, Testing, and Finishing Off .............................................................................................................55
Mono Block Wiring Check List ...........................................................................................................................................55
MonoBlock Wiring List....................................................................................................................................................55
Checklist.........................................................................................................................................................................57
Resistance Checks.........................................................................................................................................................59
Switching On and Testing ..................................................................................................................................................60
Mono Block Testing Kit ......................................................................................................................................................61
AC Wall Voltage Checks and Adjustment..........................................................................................................................61
Fitting the Feet and Base Plate .........................................................................................................................................62
Power On Notes.................................................................................................................................................................62
Final Thoughts ...................................................................................................................................................................63
Appendix................................................................................................................................................................................64
Resistor Color Code Reference .........................................................................................................................................65
AC Wiring Guide (Mk3 Mains Transformer).......................................................................................................................66
Front Plate Wiring Diagram................................................................................................................................................67
Power Supply Schematic (Mk3 Mains Transformer) .........................................................................................................68
Signal Path Schematic (Single 300B)................................................................................................................................69
Signal Path Schematic (Parallel 300B)..............................................................................................................................70
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