DYNACO PAT-4 User Manual

Page 7 of 23
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 Install this
Done

Done

Remove R1 Replace R1 by a 1K resistor (brown, black,
black, brown, brown)
1
 
Remove R3 Replace with 33K2 resistor (orange, orange, red,
red, brown)
 
Remove R4 Replace R4 by a jumper made from the supplied
22 AWG black solid wire
 
Remove R5 Replace R5 with a 48K7 Ohm resistor (yellow,
gray, violet, red, brown).
 
Remove R6

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.
 
Remove R7 Replace with 56K2 resistor (green, blue, red,
red, brown)
 
Remove R8 Replace with 4k75 resistor (yellow, violet,
green, brown, brown)
 
Remove R9 Replace R9 with a 25K5 Ohm resistor (red,
green, green, red, brown).
 
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.
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.
 
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.

DYNACO PAT-4 Specifications

General

Brand	DYNACO
Model	PAT-4
Category	Amplifier
Language	English