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
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