Page 4 of 80 
Install the Diodes .......................................................................................................... 58 
Install C13 and C14. ................................................................................................. 59 
Install the sockets for IC1 through IC3 ..................................................................... 59 
Install the Bypass Caps ................................................................................................. 59 
Install the Relays ........................................................................................................... 59 
Install the 14-pin cable connector. ................................................................................ 60 
Install the remaining non-polar capacitors .................................................................... 60 
Install the polarized electrolytic bypass capacitor ........................................................ 61 
Install the bipolar transistors. ........................................................................................ 61 
Install the tone control pots. .......................................................................................... 61 
Volume and Balance Motor Pot Installation ................................................................. 61 
Final Inspection ............................................................................................................. 63 
Install the Op-amps ....................................................................................................... 63 
If you installed sockets.............................................................................................. 63 
Section 8: Preliminary Final Assembly ............................................................................ 65 
Wire and install the front panel input connector ........................................................... 65 
Install the headphone jack ............................................................................................. 65 
Connect Power to the Tone Volume PCB .................................................................... 66 
Tone Volume Signal Wiring ......................................................................................... 66 
Install the Tone Volume PCB: ...................................................................................... 67 
Test the Tone Volume PCB Step 1 ............................................................................... 67 
Test the Tone Volume PCB Step 2 ............................................................................... 67 
Section 9: Final Mechanical Assembly............................................................................. 68 
Final Mechanical Assembly .......................................................................................... 68 
Section 10: About the Preamp Architecture ..................................................................... 69 
Features ......................................................................................................................... 69 
Gain Customization ...................................................................................................... 70 
Specifications ................................................................................................................ 70 
Appendix 1 – Shielded Cable Preparation ........................................................................ 71 
Block Diagram .............................................................................................................. 73 
Schematics .................................................................................................................... 74 
Table of Figures 
Figure 1-Empty the power supply components into a soup bowl ..................................... 11 
Figure 2-Component side of power supply PCB before loading ...................................... 11 
Figure 3-Fuse holder body solders into board, installing fuse into lid of fuse holder ...... 13 
Figure 4-Assembling Heatsink to a Regulator .................................................................. 14 
Figure 5-Solder heat sink mounting rods to retain the heat sink ...................................... 15 
Figure 6-Preparing green wire AGD-BGD jumper .......................................................... 15 
Figure 7-Install AGND to BGND jumper ........................................................................ 15 
Figure 8-Preparing power supply jumper wires................................................................ 15 
Figure 9-Jumper installation for 120 Volt Operation (left side) and 240 Volt (right side)
........................................................................................................................................... 16 
Figure 10-Power Supply before transformer is installed, wired for 120 Volts ................. 16 
Figure 11-Install 4 feet with 6-32x1/2" silver colored screws .......................................... 17 
Figure 12-IR Window with release paper, die cut mounting tape .................................... 18