Autoformer tech info is desired...

Many questions can be answered here: http://www.zeroimpedance.com/faq.html

Additional information can be found here: http://www.zeroimpedance.com/story.html

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Here's some info on the S&B transformers used by Bent Audio (NOH preamp)and DIY Audio (Django preamp):

http://www.stevens-billington.co.uk/page102.htm

http://www.mcintoshlabs.com/autoformer.aspx

Ed,
Thanks, I've got the point.
Aball,
If I had a buck I'd go for all Mac:-)
No brainer, it's literally the best electronics!

remarkable indeed. Listen to a McIntosh SS amp and find out!

Marakanetz,

Look in the tweaks section of A'gon under "zero boxes". Contact Paul Speltz via his ad or use the member directory and type in paulspeltz. You can email him regarding his "autoformers". He is a great guy and can provide you with a wealth of info about autoformers. They are remarkable in what they can do for your system.

Scifi

It's basically a multi-tapped primary without a secondary. Can be used as an impedence matching device, or also for volume control (ala Tribute, dave Slagle, etc.)

-Ed

This would be a good question to ask of McIntosh, since they seem to use a lot of these in their amps.

Have you looked at these?

http://www.zeroimpedance.com/TechnicalInfo.html