What are the more subtle sounding tube preamps?


I mean "subtle" as in relatively less tube saturation or color than your average tube-pre. Common sense tells me less tubes as in a single dual-triode, but in reality that may not be the case. I currently have my eye on a CJ Classic. Not sure if that will fit the bill.  Any suggestions welcome.
robertsong
The Herron preamp and the newer VAC preamps are all neutral sounding - do not have the traditional tube sound.  Less midrange focus, and more soundstage extension and definitely tighter more pronounced bass.
Check out Wyetech Labs preamps using ultra fast grounded grid circuits with only 3 stages, two of which are cathode followers which means only one stage provides the gain, simple in theory