Audioquest makes a spade that will fit, as do others. Two commonly used spades are the "Bar" and "Bar8" depending on the size wire you are going to use with them. I believe the spacing between the the two forks is 3/16". I use the Audioquest spade with my MC275. You can order them on line or by phone from RAM Electronics. Just google them.
Also, as mentioned above do not mod your MC60's! There are some components inside that may need updating if it has not been done already. Have them gone over by a tech with experience working on vintage McIntosh amps. DeWick Reairs is one such tech. You can find more info on the McIntosh forum over at Audiokarma. Good Luck.
Also, as mentioned above do not mod your MC60's! There are some components inside that may need updating if it has not been done already. Have them gone over by a tech with experience working on vintage McIntosh amps. DeWick Reairs is one such tech. You can find more info on the McIntosh forum over at Audiokarma. Good Luck.