Are the McIntosh Amps Class A or AB?

[CapWKidd 10+ year member]

They are pretty large/low power rated... suggesting they may be class A...

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[Brian_smith06 10+ year member]

Or very under rated? I'm not sure of the answer though?

 

[CHEMMINS 10+ year member]

Macs are a bit underrated and some are class a and some are a/b's