Have thiel 3.6's. Will mcintosh ma6600 work?

^Good to know! But, $300 each is a bit steep.
Though it wasn't advertised policy, if the repairs weren't due to abuse, IME Thiel used to do repairs gratis, and only charged a house discounted shipping cost one(!) way, even for items that were past the generous 10 year warranty.
Man, I really miss Jim, Shari, Gary and the rest of the gang!

"06-21-14: Unsound
The Mac's with their autoformers won't double down into the 3.6's rather challenging load. Not what I would recommend."

I thought that was the whole point of using autoformers. The amp sees a consistent load.

As I mentioned, I like these speakers enough to warrant the $600 investment in having them repaired. I paid $800 used, so a total of $1400 for the pair strikes me as a reasonably justifiable expenditure. (Reasonable - ha!) I have since seen them less expensive on the "Gon and elsewhere, but mine were in near perfect condition - the grills were re-done a year before I purchased them. They're my favorites so far...quite amazing. My Pass X150.5 is a good match - I just picked up an Audio Research SS Preamp with balanced connections and I can't wait to see what happens.

zd542, Typically as a speakers impedance changes so does it's sensitivity. The Mac's use of autoformers compromises the advantages of quality high current ss amplifiers to maintain linear frequency response.

Oblgny, I agree the 3.5's are worth repairing. IMHO, they have always been one of the top value speakers available. Your Pass amp is surely a lovely combination with them.
Still, $300 seems a bit steep. Though perhaps a bit back in time; I'd hazard a guess they didn't cost too much more new. A simple rebuild shouldn't cost that much.
You're right to question those e-bay sellers regarding the drivers being sold as OEM. Though back then Jim Thiel used outside sourced drivers, they were modified to his specifications. Off the shelf manufacturer drivers though similar, are not exactly the same.