Inspection And Preliminary Reassembly; Figure 7-Both Pcbs Reassembled Onto U Brackets, Ready For Installation - DYNACO PAT-4 Assembly Manual

preamp. Using R6=1650 Ohms can be beneficial in some cases, but is not necessary. It's
most likely to matter if you have a high output cartridge playing highly modulated
records with lots of high frequency content.
Making this modification nearly doubles the current drawn by the phono preamp, so
you'll also need to make a modification to the PAT4PWR power supply.
Remove R15
Remove R19

Inspection and Preliminary Reassembly

Inspect your work for good solder joints and freedom from solder bridges. Touch up any
questionable connections now. It will be painful to have to disassemble things to repair
something later. Verify that the eyelets along the tops of the boards are free of solder and
are ready to accept the labeled wires.
Attach the PC boards to the U-shaped bracket. Use the original 4-40 screws and the new
4-40 keps nuts. They have captive lock washers that simplify reassembly. Screw the
assembly of PC-boards and U-shaped bracket back into the PAT-4 chassis. Use the
original 6-32 screws and the new 6-32 keps nuts (also with captive lock washers).
Figure 7-Both PCBs reassembled onto U brackets, ready for installation (DRD4 kit installed also)
PAT4PWR Power Supply Modification
Replace with 2K resistor (red, black, black, brown, brown)
Replace with 2K resistor (red, black, black, brown, brown)
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