MAC Autoformers?

I have used many Mac amps over the years (since 1978) except for the latest models, whose prices are truly hideous! My conjecture is the same as ONTJESR, the 7200 was/is the best amp they've made, and with no autoformers.. In my experience, all the autofromer models had a "flabby, not tight" bass. The 7200's bass is deep and tight. I always thought what most of you express, if they're so great, why don't other manufacturers use them? Mac claims it lets them match the loads to any speaker impedance. I own the 7200, and have yet to hear the un-tube-like sound some of you claim to hear. This is their best amp I've heard! THEO says it about right!

The reason I though the autoformer was a good thing is that my speaker manufacturer (Merlin)suggested that if I want to add an SS am (I own two tube amps that I switch around)to consider the MacIntosh with the autoformers, which is interesting in light of some of what has been said here in that they have a very easy load and very smooth impedance curve, where the autoformer would seem to be less needed. Well I think I'm going to decide based ergonomics and not worry too much about the AF/non-AF issue. Any opinions on differences in sound quality, or other considerations between the 6300, 6500, and 6600. Power is not an issue, my speakers run perfectly fine on 50 watts or more.

I think the 6300 is a sleeper......It does use THERMAL TRAK
which keeps it running cool all day.....it does not have
BASS/TREBLE controls but the pre-amp section is great.

It uses LED's instead of bulbs.......I thought the 6500
was quote unquote "louder" but the 6300 sounded better to me.

I like balanced inputs my self which the 6300 has.
With MAC people do not talk enough how important your source (cd player, dvd player, server etc.) is relative to your sound. Do not get me wrong, I know it is on all equipment, but you can REALLY hear the differences
on MAC stuff. Only as good as what you plug into it.

All three are good pieces of equipment. Never understood why the 6600 has such a bad rap.

That is funny about the guy who always bashes Mcintosh and has it himself. I know someone similar. According to my friend, McIntosh cannot do anything right except in his own listening room. Go figure.

Hi all, After reading this discussion I just thought I'd mention that I've noticed on the used market McIntosh amps that have autoformers seem to go for more money than the ones without. I've seen some Mac amps from the 70's go for more money that ones with out autoformer that were made in the 80's and 90's. Also I have a Mac MC2105 and I think it sounds much better than the Adcom or the Belles amps that I had prior to it. And go figure, the Mac is close to 40 years old and still works like a charm.

My System:

McIntosh MC2105 Amp
McIntosh C504 Preamp
Sansui TU666 Tuner
California Audio Labs Alfa DAC
California Audio Labs Delta Transport
Micro Seiki DDX 1000 Turntable w/ Sumiko Premier MMT tonearm/Linn Asak MC cart.
Musical Fidelity X-LPS phono preamplifier
Vandersteen 2CE Speakers