AUDIO INTERFACE
This is another transformer that is very similar in quality to the RWR above. It's also very rare and difficult to find.

Further- A reader has informed me that he compared this model to a Verion (Cotter). He felt that the Verion sounded "thin and harsh by comparison". He also commented that the Audio Interface lost nothing at the frequency extremes and had plenty of "body". In another comparison, this same reader felt that a different version of the Verion was much better ("a dramatic improvement"), but it was still not the equal of the Audio Interface.

Even if both of the Verions had an impedance "mismatch", the fact that the Audio Interface was equal or better to them is a very strong endorsement for this model.