Anyone has a reference system where amplification is SS ?

@OP If "reference sound" is sought then tube rolling is a disadvantage. How can you have a reference if the sound changes everytime the active devices are changed?

@yoyoyaya  different solid state devices sound different, but can still measure as transparent. There really is no transparent audio equipment.

@invalid - I haven't argued that SS devices are transparent. The point is that, assuming that the manufacturer is strict about tolerances, SS amplifiers will sound the way they were designed to sound. Tube equipment will sound different depending on which tubes are installed.

There are plenty of transparent SS amplifiers. 

many many many...