Pc Board Modifications - DYNACO PAT-4 Assembly Manual

PC Board Modifications

The listed procedure will be repeated for both left and right channel PC boards. In
general, you will:
 Remove the indicated component
 Clear the solder from the associated PCB mounting holes
 Install the new component, carefully following the directions, as you'll mount
some of the new components in unconventional ways to generate the upgraded
topology of the phono preamp.
 Make a check-mark the left or the right channel board as you complete the step.
Remove this
Remove R1
Remove R3
Remove R4
Remove R5
Remove R6
Remove R7
Remove R8
Remove R9
Remove R30, if
your board has it. If
it's present, it will
be parallel to C4,
between C4 and the
eyelet edge of the
board.
1
In Rev A of the kit, R1 was replaced by a jumper. Using a 1K resistor provides slightly higher white noise
levels but typically less hum.
Install this
Replace R1 by a 1K resistor (brown, black,
1
black, brown, brown)
Replace with 33K2 resistor (orange, orange, red,
red, brown)
Replace R4 by a jumper made from the supplied
22 AWG black solid wire
Replace R5 with a 48K7 Ohm resistor (yellow,
gray, violet, red, brown).
 Replace with 3K32 resistor (orange,
orange, red, brown, brown) supplied, or
 Alternatively, you can replace R6 with
the supplied 1650 Ohm resistor (brown,
blue, green, brown, brown), but that
requires you to modify your Update-
mydynaco PAT4PWR.
Replace with 56K2 resistor (green, blue, red,
red, brown)
Replace with 4k75 resistor (yellow, violet,
green, brown, brown)
Replace R9 with a 25K5 Ohm resistor (red,
green, green, red, brown).
If your board has a place for R30 then
replace R30 with the enclosed 48K7
resistor (yellow, gray, violet, red,
brown).
If your board doesn't have a place for R30
then you'll wait to the end of this section
to add R30 to the board.
Page 7 of 23
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