I myself use a Easter Electric BBA: buffer booster amp that acts like a preAmp. its a Champ.
It also offers only 2 knobs on the front: gain and volume.
I cant recommend these type of BBA;s enough.
Not just for improving the SQ, but especially for those of us who like older music where the recording was not that great. The Gain adjustment fixes it quite well.
GLWS.
Anyone serious about this amp should just try it ...