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If you can find evidence showing that Mac has a patent on their autoformers,I would like to see it as well.
I think they tried to but never succeeded.
I haven't owned any Mac gear in about 25yrs and I certainly don't miss it one bit even the tube amps I had.
We have a fair size audio club in my area and every once a while I get to hear a Mac product of some kind always reminds me of the sound I don't care for.
Properly pairing components together with Impedance matching in mind would never need autoformers,but I do know some folks that just love their Mac gear and wouldn't have anything else.