don't change anything. the mc60 is hardwired, and rightfullt so. you can also buy wire ends which are specifically for mac and other vintage gear.
McIntosh MC-60 Binding Terminals
I own a set of McIntosh MC-60 monoblock amplifiers. They are original so employ the Barrier strip small speaker terminals. Can someone out there direct me to a source to purchase the spades necessary to connect a set of speakers? Additionally if an Mc-60 owner can identify a source to reliably update this amp with minimal modifications I.E. standard speaker binding terminals or detachable power cord socket? Any observations in terms of what I can anticipate for sound would be most welcome. Have never heard this amp but by all acounts, its supposed to be quite respectable.