Anything Like a Joule Electra?

(By stepping up the impedance of the load your OTL amp sees, you'll get a bit better control in the bass region and a bit better dynamics.)

But then it is no longer an OTL.

I suppose I ought to respond to that one.

The ZERO is an autoformer- the simplest type of transformer available. It has only one winding and does not block DC. Additionally, its turns ratio is exceptionally low, as the translation in impedance is typically from 4 ohms to 16 ohms.

The combination of these factors allows the device to have wider bandwidth then most transistor amplifiers- something in the neighboorhood of 2Hz to 2MHz.

A transformer like this is not normally possible with a conventional tube amplifier. Most output transformers (i.e. most tube amps) have trouble with four ohms and less anyway- the reduction in performance is easily measured and heard. The ZERO offers a bona-fide method of overcoming the four ohm problem, and has found application with many transformer coupled tube amplifiers as well as OTLs...

Actually, they would still be OTLs, because the Zeros are not output transformers but auto transformers, seen as part of the speaker, instead of the amp.

Someone more technical than I can explain it better: http://www.zeroimpedance.com/faq.html#12 Questions #12,13.

beautiful amps... if you can't do the Grand Marquis and stay married (I sure couldn't), how attached are you to the dyns? So many great speakers out there - if you have an amp you love (and several choices of speakers) perhaps you should adjust the other. Just a thought.

Jacob