In July 2017 my pre amp had failed after many years of faithful service. Only problem it is in Barbados. Anyway I travelled and brought it with me. I met with JS and agreed have to the upgrade that he recommended. Its now February and a few months of running in, I truly say the upgrade has brought a new level musicality and openness to my music. I have played all my favourites and I am thoroughly pleased with the subtle improvements that I am experiencing. Thank you JS, one day you might have to upgrade my XA-200’s but due to their weight I’ll have to wait for them to fail.