I've fallen in love with Tech 21s Bass VT series of DIs and stomp boxes over the past two years. The VT is specifically designed to mimic vintage Ampegs, but it's generally very similar in layout to the Bass Driver. Bottom line is, their stuff sounds amazing, and all analog.
If you want something much simpler, I'm also a fan of the Sadowsky pre amp pedal. Bass, treble, volume. That's it. Boost only (no cut), so fully counterclockwise is actually "zero" rather than 12 o'clock. Frequencies are 40 and 4000.