Page 4 of 68
Install the Sockets, Integrated Circuits and Transistor ................................................. 57
Install the Control Cable Connector ............................................................................. 58
Install the Motor Pots (Skip for NR version) ................................................................ 58
Section 8: Preliminary Final Assembly ............................................................................ 60
Wire and install the front panel input connector ........................................................... 60
Install the headphone jack ............................................................................................. 61
Connect Power to the Tone Volume PCB .................................................................... 61
Tone Volume Signal Wiring ......................................................................................... 61
Install the Tone Volume PCB: ...................................................................................... 62
Install the Op-amps into the sockets ............................................................................. 62
Test the Tone Volume PCB Step 1 ............................................................................... 63
Test the Tone Volume PCB Step 2 ............................................................................... 63
Section 9: Final Mechanical Assembly............................................................................. 64
Final Mechanical Assembly .......................................................................................... 64
Section 10: About the Preamp Architecture ..................................................................... 65
Features ......................................................................................................................... 65
Specifications ................................................................................................................ 65
Appendix 1 – Shielded Cable Preparation ........................................................................ 66
Block Diagram .............................................................................................................. 68
Table of Figures
Figure 1-Empty the power supply components into a soup bowl ....................................... 9
Figure 2-Component side of power supply PCB before loading ........................................ 9
Figure 3-Fuse holder body solders into board, installing fuse into lid of fuse holder ...... 11
Figure 4-Assembling Heatsink to a Regulator .................................................................. 12
Figure 5-Solder heat sink mounting rods to retain the heat sink ...................................... 13
Figure 6-Preparing power supply jumper wires................................................................ 13
Figure 7-Install AGND to BGND jumper ........................................................................ 13
Figure 8-Jumper installation for 120 Volt Operation (left side) and 240 Volt (right side)
........................................................................................................................................... 14
Figure 9-Power Supply before transformer is installed, wired for 120 Volts ................... 14
Figure 10-Install 4 feet with 6-32x1/2" silver colored screws .......................................... 15
Figure 11-IR Window with release paper, die cut mounting tape .................................... 16
Figure 12-Installing power outlets and IEC connector...watch orientation! Installing the
power switch…watch orientation! .................................................................................... 18
Figure 13-Insert cable ties, then lay twisted pair into the chassis corner ......................... 19
Figure 14-Form switch wires to avoid the ground stud .................................................... 21
Figure 15-Adding Lug to Ground Harness ....................................................................... 22
Figure 16-AC Power and Ground Wiring ......................................................................... 22
Figure 17-Transformer and power supply assembly ready for installation ...................... 23
Figure 18-Fasten the transformer to the preamp right side wall ....................................... 27
Figure 19-Power Supply assembled and installed ............................................................ 27
Figure 20-Silk screen of the “component side” of the controller PCB ............................. 29
Figure 21-Insert all the IC’s so that the U-shaped indent matches the silk-screen ........... 31
Figure 22-10 pin cable connector pinout .......................................................................... 33
Figure 23-locating the pins on the 16 pin cable connector ............................................... 33
