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I was down in DC a few weeks back for a family celebration and I was able to sneak in some time with my audio family. I saw Barry on the way down and then had a great time with family at my nieces graduation. When the festivities ended about midnight I rang Ijaz and as usual he was ready for the third shift. Mike was interested in coming by to chat about crazy ideas and when he showed up he came with booty in hand that he had pulled from equipment over the years.
It was an assortment of UTC "ouncers" he wanted to see put into use and I felt obligated to accept them. In the lot there were 4 of them marked 25A27 and my internet searches didn't turn up anything so to the bench I went.
I suspected they were lineout transformers but the interesting thing is when put in reverse they seem to function comparably to the mic inputs as SUT's. The nice thing about them is the step up ratio is much lower than the traditional "vintage" mic input units re-purposed for SUT usage which means you do not automatically load your cartridge down. They appear to be 1:9 devices with a CT that will allow for a 1:18 ratio.
The above measurements are using a 15 and 40 ohm source impedance (denon 103 and 103R) and the termination is 47K. Ratios are roughly 1:10 and 1:20 with some losses and the 20Khz top end is met. On the low end bandwidth will be low enough to pass the footsteps of your neighbors.
For comparison, I'll offer up some earlier plots from some peerless 4722's and 4665's. Of course these are not apples to apples comparisons but if you can deduce that this particular apple is your flavor....
They may be brilliant, they may be a headache, they may even hum yet the rule remains the same. If you win it, you need to try them and report back.
Addendum... As with all of the giveaways here, things are random and you need to enter your name. We don't do first come first served and let lady luck determine who gets them. They came to me for free and they will all go out to people for free. I just need to measure and document them so it may take some time.