Thanks for using the search. I won't list the threads here. I'm glad you read thru them. This one is especially good and read Brad's WARNING about NOT shorting your speakers: forum/viewtopic.php?f=309&t=8253&start=15
It's easy. You just have to lift one leg on two resistors and two diodes on the output card/cards.
I took a photo to share below.
At the top of the board you can see where I lifted a leg on two resistors. R27 and R29.
Toward the middle lower right on the board you can see where I lifted one leg of two side by side diodes located just below the two orange ceramic caps between the big square heat sinked transistors. D5 and D7.
If you do both boards, you do the same to the other one.
The service manual. Scroll to page 4 to see the layout.
http://akdatabase.org/AKview/albums/use ... ervice.pdf
Personally, I don't think this is a make or brake mod in as that the McIntosh will not clip until very high volume is achieved. I do, however, feel it is part of the equation.
Special thanks to Mike Wald