Anyone has a reference system where amplification is SS ?

I’d say it depends on your definition of what a "Reference System" is.

+1 @mahgister 

Don’t know why OP wants to lose respect and credibility. So unnecessary. 

The concept of reference system is a relative not an absolute ...

It depend of implementation of acoustic, mechanical (vibrations/resonance) and electrical noise floor control among others factors ... It depend not only of each specific parts , tubes or S.S. but it depend of their synergy as perceived in a room designed for the system ...Not a show room ...

Then reducing the concept of reference system to S.S. versus tubes or class D is misunderstanding the great number of factors at play for the experience ...

And by the way psycho-acoustics rule the gear design and experience not the reverse...

Audiophiles or consumers programmed  obsession by marketing  is not knowledge ...

This pretty much explains the why of it...

DeKay

A "reference system" is simply an audio enthusiast’s primary system that they use as a comparison (or a "reference") when auditioning new electronics, speakers, cables, etc. Being one’s "reference" does not necessarily mean the system is anywhere near state of the art/science.

I do not understand how someone with over 7K posts here could say they have,

never heard of audiophiles whose reference system had transistor amplification

Just check the virtual systems for an answer to your question.