I would. It is worth it....
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At this point at this age they really need a bit of servicing. The big issue with older amps is usually capacitors but all of the parts need to be checked to make sure they are operating within spec and rebiasing needs to be done (even on transistors. It might be expensive but it is the right thing to do do
Audio Classics. These guys are ex Mac employees and they can even take you on a tour of the Mac factory. I stopped by there a few years ago and was flabbergasted at their operation. Tour busses full of Japanese tourists stop by this place. The amount of Mac gear sent to Japan is amazing. I would guess that's where most of their business comes from. Anyhow, even if you call Audio Classics just to get a second opinion it's worth it. Very nice group of Mac lovers. The amps are repaired by ex McIntosh engineers from what they told me.