Koetsu Urushi + MC step up transformer


After years of listening to my Koetsu Urushi fed directly into the 47K MM input of a Conrad Johnson PF1 I have started using a step up transformer. It is built around a pair of Lundahl transformers and I have tried some different loading resistors but I find the sound is quite harsh and has lost some of the air and space it had before.

I was told that the transformers would need 50-100 hours of bedding in and they would loose the harshness... Hmmm. I've never been a great believer in the burn-in philosophy for entirely passive components - like bits of wire - will a MC transformer burn-in to any extent or should I continue playing with the loading to find the best match or just toss the whole thing out the window?
68spider

Showing 1 response by samleung

I have used Urushi for almost 20 years and had used it with a pair of KPA as phono pre-amp. Now I have Ensemble Ponobrio and set loading at 132 ohmn. Over the years I set at around 100 ohmn. I have friend whose loading set at 47K. Since you don't get the air and space with it, it sounds more like your loading isn't correct. It will improves when the transformer fully break in.