Sorry - I meant a preamp with an "Instrument" input. They are often called Line input, but they are intended for use with guitar, bass, synth - whatever. Unbalanced hi-z "consumer" line input if you prefer. If your preamp has plenty of gain range it's semantics really.
An example is my API A2D. The Line inputs are called "Line" inputs, but the A2D sounds fantastic for DI bass or guitar. Colored, but in a really good way.