could you be more specific....tube or solid state...remote/non remote.
i would agree the comments on the bat 3vki except....the unit used 6-6922 tubes( if my memory serves me correct) and there is a shortage of premium 6922/7308's.
imo, i would try to avoid any preamp that requires more than 2 of them. the retube would be a major expense
hope that helps,
mike