I'm not a 596 fan either. I don't find them sounding the same as as 5U4G tubes Stavros. The 596 is very dynamic whilr the 5U4G have more body and bass, treble is not as pronounced as with the faster 596. It was nice to try and I thank Clayton for the tube, but it's been safely stored now. The RK60 is a mix of both but it's closer to the 5U4G.
It seems like we finally got people to try the RK60. I hope they'll like them. I personally think people just want to use rectifiers that need adapters with connectors to go on top of the tubes, just cause they look cool.