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Table of Contents
Table of Contents ................................................................................................................ 2
Table of Figures .................................................................................................................. 2
Section 1: About This Manual ............................................................................................ 3
Who Should Attempt these Projects? ............................................................................. 3
Tools and Supplies You’ll Need ..................................................................................... 4
Recommended Solder ..................................................................................................... 4
Project Overview ............................................................................................................ 4
Important Safety Notes ................................................................................................... 4
Section 2: About the Phono Preamp Upgrade .................................................................... 5
Effects of the Modification ......................................................................................... 5
Before you Begin ........................................................................................................ 5
Prerequisites ................................................................................................................ 5
Preparing to Remove the Circuit Boards .................................................................... 6
PC Board Modifications ............................................................................................. 7
Adding R30 if your PCB doesn’t have a place for it .................................................... 11
Installing the DRD4 Kit ................................................................................................ 11
PAT-4 PWR Modifications (Optional) ..................................................................... 11
Inspection and Preliminary Reassembly ................................................................... 12
Final Wiring and Reassembly ................................................................................... 13
If you want 5 high level inputs and 1 phono input ................................................... 13
Final Sanity Checks .................................................................................................. 17
Prepare to Reconnect your PAT-4 to your Music System ........................................ 17
Appendix 1: The Toothpick Trick ................................................................................ 17
Appendix 2: First Class De-soldering ........................................................................... 18
Schematics .................................................................................................................... 19
Record Playing Reminders ........................................................................................... 21
Appendix 3 - Preparing a Shielded Cable End ............................................................. 22
Table of Figures
Figure 1-Stock PCB (before upgrade) ................................................................................ 8
Figure 2-Stock PCB (after upgrade) ................................................................................... 8
Figure 3-Detail of R2-C3-white-wire connection ............................................................... 9
Figure 4-Preparing C4 for installation .............................................................................. 10
Figure 5-Insert R30 in from the back of the board ........................................................... 11
Figure 6-Final step of R30 installation in those cases where holes don’t already exist on
the PCB ............................................................................................................................. 11
Figure 7-Both PCBs reassembled onto U brackets, ready for installation (DRD4 kit
installed also) .................................................................................................................... 12
Figure 8-Changes to grounds for 5 high level input version of PAT-4 ............................ 14
Figure 9-Adding shielded cable as part of the 5 high level input modification ................ 16
Figure 10-Schematic shows phono preamp with modifications (3 High level and 3 phono
level inputs) ....................................................................................................................... 19
Figure 11-Schematic when modified for 1 phono and 5 high level inputs ....................... 20
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