Antonio, you might information about Expressive Technologies transformer at here:
I have linked it form ‘My Playback’ section, also in there should be link to a Stereophile article about SU-1 from beginning of 90s. It was in a king of customary-foolish article where a typically idiotic-reviewer (I do not remember who was it) plagued the ET-1 transformer into a low impedance input of the Curl’s Blowtorch and then he complained that when violins went to crescendos his wife cactuses lost their thorns.
The ET went out of business and I do not think you will fish those transformers, although the accidents are always possible. I know there is a guy in UK who has one ET-1 sale but he wants somewhere around 7500 pounds… quite aggressive price I think. I sold my ET-1 a few months ago and I do not know where to get more. (BTW, talking about the irony: the dirt that runs Audiogon banned me from there because he believed that I should not sell a transformer for more money than the value of his entire trailer. What a cheap profound idiot!!!)
I would like no one subscribe a notion that it is necessary to search for the ET-1 (or any other “better” component). ET magnetics were fine but it was good if you are a specifically interested in that “goodness”. Also, it is very important to understand that this specific interest in the “goodness” has nothing to do with the actual benefits a person can get out audio. Yes. ET-1 does some unique things to sound but after you have it on your shelf then you forget about it and still listening the recording instead of the ET-1’s benefits. What I am trying to say that all those ET-1 advantages (or the advantages of any other “superior” audio components) has meaning only when we do our audio-talk. For music listening all those audio-talks are very much irrelevant.
Alternatives? Many people recently use S&B. The 103S are les interesting then ET-1 (the S&B unfortunately does just gain, nothing else) but for the money S&B do OK. In fact, I feel that S&B better then many other transformers. For instance the S&B is way better then the Graham’s transformer, although when I had Grahams it was a preproduction prototype and perhaps they did better later on … Yet, although the S&B is OK transformer but I still feel that the hype around S&B is blown primary due to low requirements and low demands of the transformer users…
"I wish I could score everything for horns." - Richard Wagner. "Our writing equipment takes part in the forming of our thoughts." - Friedrich Nietzsche