I wished I would have seen this when I had a need for a similar transformer to get my AM TX audio into the TS850.
I had to buy a Radial product that was in a nice metal enclosure and bragging about being totally EMI immune and the highest quality for audio. It boasts using a Jensen transformer..The ad looks like Audiophoolery
http://www.musiciansfriend.com/pro-audio/radial-engineering-j-iso-jensen-transformer-equipped-stereo-isolator-4db-to-10db-converterThe unit I bought was a single channel and only $119.00,,,,,,ouch
Fred