The latest upgrade from JS Audio is to my KW750 power amp and was a Stage 1 plus WBT terminals plus 1kW Audio Grade transformers. Now that the amp has had some time to “run-in” the difference is substantial with improved dynamics, transparency and clarity. Sound stage is bigger and better defined and music just flows (even more) effortlessly. Many years ago I had a KW500 upgraded which also made a big difference and last year my KW Phono pre-amp was upgraded which was again substantially better for the work that John carried out and encouraged me back to vinyl again. One more bit of kit is waiting in the wings for the upgrade magic, hopefully I’ll be able to call John and book that later this year.