Digital Board Installation .................................................................................................................................................. 56
Section 8: Digital Board Power Supply Connections ........................................................................................................... 57
Section 9: Line Board Construction ..................................................................................................................................... 58
Installing the Valve Bases ................................................................................................................................................ 58
Parts List .......................................................................................................................................................................... 58
Installing the Resistors ..................................................................................................................................................... 59
Installing the Electrolytic Capacitors................................................................................................................................. 61
Installing the Film (non-polarized) Capacitors .................................................................................................................. 61
Board Orientation ............................................................................................................................................................. 62
5687 Filament Wiring ....................................................................................................................................................... 62
Section 10: Installing I/V transformers ................................................................................................................................. 63
Wiring the I/V Transformers ............................................................................................................................................. 64
Section 11: Connecting the 5687 Output ............................................................................................................................. 65
Connecting the 5687 HT to the power supply .................................................................................................................. 65
Connecting the Output Transformers ............................................................................................................................... 65
Output Transformer Type 1 (Single-ended Only) ......................................................................................................... 66
Output Transformer Type 2 (Single-ended or Balanced) .............................................................................................. 67
Section 12: Source Selection and Switching ....................................................................................................................... 68
Installing the Input Selector Switch .................................................................................................................................. 68
Input Connections ............................................................................................................................................................ 69
Connecting the RCA Input ............................................................................................................................................ 70
Connecting the USB Input ............................................................................................................................................ 72
Connecting the XLR Input ............................................................................................................................................ 73
Section 13: Turn-on Procedure ............................................................................................................................................ 74
Final Thoughts ..................................................................................................................................................................... 75
Appendix .............................................................................................................................................................................. 76
Resistor Color Code Reference ....................................................................................................................................... 77
Analog Board Schematic .................................................................................................................................................. 78
M2 Power Supply Board Schematic ................................................................................................................................. 79
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