If you don't need a remote and don't mind an older preamp in the $600 or under price range my favorites are the McCormack TLC-1 Passive Preamp and an Accuphase C200.
If you need a remote a favorite of mine is the Kavent S-33 preamp. It also goes by the Vincent Audio SA-93.
Tube wise I've read good things about the Dared SL2000A.
To get better help let members here know what other components you have in your system or other gear you have enjoyed in the past. Also letting members know what you feel is lacking with your current system will help with recommendations as well.
If you need a remote a favorite of mine is the Kavent S-33 preamp. It also goes by the Vincent Audio SA-93.
Tube wise I've read good things about the Dared SL2000A.
To get better help let members here know what other components you have in your system or other gear you have enjoyed in the past. Also letting members know what you feel is lacking with your current system will help with recommendations as well.