plz suggest a tube preamp to match Parasound A21 amp


Hi, I'd like to add some tube attitude to the signal entering my Parasound A21 amp. Plz suggest decent tube preamp under $2,500...New or used, but no 20-30 years old, vintage stuff plz. Fully balanced design is preferred. Combined XLR / RCA inputs/outputs are necessary. Recently tried Schiit Freya Plus, but didn't like it due to weird volume control function and delayed start. Tnx.

surfmuz
Freya +/A21 combo sound better than my SS (p6)  and I know that I could play with tube rolling to polish the SQ, but that clicking-scraping volume control and pretty long start delay of Freya is Just not for me. 
There’s a Unison Research Unico PRE available here for $2k (MSRP about $5k).  They fly under the radar but make really good stuff.  Best of luck.