Preamps for $300 to match with B&K st-140?


Im trying to get a little more warmth and power to my JM Labs Chorus 706's so I picked up a B&K st 140 amp. Now I need a pre to go with it. I want something under $300 that has a tone bypass, and maybe a phono input. Im going used so vintage is ok. Tubes are good too. Thanks for the help!
bundee1
Sorry, I have to disagree with the passive and AI recommendations. The B&K ST140's rather low input impedance does not make it an ideal candidate for passive or high impedance out-put preamps. I tried a couple of passives with the B&K and didn't care for the combination. The B&K Pro 10 could be the ticket. The B&K ST amps can be a bit mushy in the bass, becarefull not to overdo it with preceeding "warmth".
Look for used Forte preamp. I know the Model 2 will work very nicely.

Happy hunting.
I am useing a Parasound 850 with my B&K ST-140 right now in my den system and it sounds good. The Parasound has a phono section also and they can be found for cheap used