If it has to be an inexpensive tube pre...try a Dared SL 2000; $250-300 used. It doesn't have much gain and only has 2 or 3 inputs, very good for the money.
If 1 input is ok than get a Placette. $600-700 used, it is passive & not tube but excellent.
If 1 input is ok than get a Placette. $600-700 used, it is passive & not tube but excellent.