Koetsu Step-up Transformers

RC, I owned one in 1985 to run the Koetsu ONYX sapphire I had, going into an ARC Mag phono input. While I assumed it would be the step up of choice, the Cotter, beat it in the Mk IIL version. I later purchased a preamp with enough gain, and that beat all of the boxes I had on hand (including the highly regarded Klyne and ARC MCP-33. Hope this helps.....Frank

Koetsu is good, but try Vendetta SCP2-D (I go from Red Signature to ARC SP10-II input!)the best even made.
Good luck!

Thank you both for your input. Actually, my preamp has considerable gain (Jadis JP80, which replaced a Vendetta/Jadis JPL combo years ago), but the Koetsu cartridge I recently purchased is low enough output that it forces me to turn up the volume pots to where tube noise and a persistent hum I still haven't gotten rid of become intrusive (this problem was not noticable with the higher output Ruby 2 cartridge it replaced). I once used an Expressive Technologies step-up with the JP80 for a Transfiguration cartridge with excellent results, but sold that years ago when the Transfig. gave up the ghost. Silly me! I have a chance to pick up a recently manufactured Koetsu step-up for a decent price, with a home trial, and do a favor for a friend at the same time, so ultimately I can decide with my ears, but I was curious about others' experiences because I had not realized Koetsu made them.