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Figure 4-Showing locations of C3, R3, and R11
If your PSUG was shipped before the end of 2018, it won’t have the gray 1µOK100
capacitor, but the locations of the changed components are still the same.
Add a mounting hole to the bottom of the chassis
To complete the new mounting arrangement, you’ll need to add a 9/64” hole to the
chassis bottom. A 9/64” hole is the standard size to pass a 6-32 screw. Follow carefully
the layout shown in Figure 5. After laying out the hole and checking its location, I like to
use an awl to make a depression in the metal right at the center of the hole location.
It’s probably a good idea to form a catch basin of duct tape on the inside of the chassis.
This will catch the metal shavings before they can cause random havoc and short circuits
inside your amp.
Mount the power supply to the Really Big Heat Sink
1. Smear a thin film of thermal compound onto the mounting surface of the power
MOSFET. If the old thermal compound seems dry or crusty, you might want to
remove it first using isopropyl alcohol and paper towels. Be careful, isopropyl
alcohol and paper towels are quite flammable.
2. Insert the following screws loosely until you see that everything fits, then tighten
the screws:
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