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MAC Autoformers?

Someone is selling a MAC MA6500 Integrated claiming its superiority over the Ma6600 due to the fact that "it does not have the degrading autoformer design found in the MA6600". That is the first time I've heard a claim that the autoformer was a hindrance to better performance; I thought quite the opposite. What do you MAC Maves think?
pubul57

Showing 1 response by almarg

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almarg
9,670 posts
 
C1Ferrari 9-6-2018
Very cool thread ;-)
 +1.  Great thread.  And thanks to Ralph and Roger for providing their informative if somewhat different perspectives.

Roger, regarding...

The Futterman amplifiers have over 60 dB of feedback and a good reputation.
I've seen that stated before, but I'm wondering how an amp can be designed with 60 db of feedback.  Wouldn't its open loop gain have to be enormous to support a closed loop gain that is reasonable?

Best regards,
-- Al

P.S:  Bruce (Bifwynne), great to see you posting again recently. 
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