Suitable tube preamp for pass labs x250


I'd like to get a tube preamp to use with pass labs x250 power amp. What are your recommendations? I'd like to get a nice, smooth and rich sound from Dynaudio S5.4... I listen to mostly acoustic music, jazz/free jazz with lots of dynamics and rock and roll with plenty of lo fi recordings...

Price bracket would be $4000-$6000
Thanks a lot!
128x128janhavjar
Tvad, the output impedance of the MP-1 is closer to 30 ohms, not 350. Its bandwidth is unaffected by load.
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