good preamp for First Watt F7


Hi everyone,
I'm looking for a good preamp for my First Watt F7 amp.
I'm using now my PS audio DS DAC as an preamp.
F7 has input impedance 10K Ohms, gain of 14 dB.
Thanks
128x128bakalovb
I once had a First Watt M2 amp that I employed through a simple tubed pre - I forget what manufacturer.  It sounded beautiful.  After that I always put a tubed pre with my Pass Labs amps, too.  Just a “me” thing but I liked the results. 
Post removed