I have a pair of -60db C-Core Transformers that I had ordered from Promitheus Audio to build a passive preamp. It is his best pair used in his reference version TVC. The wait was so long, I ended up building a passive with a pair of Stevens & Billington trannies and am content to stay there. Avoid a long wait - they are still in the original wrapping. These are hard to come by unless you are very patient

. I can see that the taps are all labeled through the plastic. Let me know if you have any questions. No schematic is included just the taps labeled.
$500 (picture on audiogon)