I don't think I have ever heard someone say this tube amplifier is the most solid state sounding yet.
Rrog (Answers | This Thread)
I have heard comments, and I believe read comments in which people characterized a particular tube component (amp, preamp or source) as sounding "similar" to solid state.
I have certainly listened to, and owned, some tube components that sound very close to solid state; to the degree that I did not see an advantage to owning this tube equipment versus a solid state alternative.
To avoid a flame war, I'm not going to be specific about the components or the brand(s).