Oh baby! I live in Birmingham, AL and there is a guy here named Sam Timberlake who builds some boutique guitar amps called SAMAMP. Well...he decided a few years ago, to my knowledge, to build a prototype bass preamp. I have the most recent version of his experimentation with bass preamps. It is incredible...absolutely incredible! Easily beats out any other preamp I've had. It can sound like a Trace Elliot V-Type preamp...can sound like a B15N preamp...can sound like a pushed grindy SVT...and sound like a nice Avalon u5 pre but with more warmth. I purchased the preamp from Highland's Music in Bham and apparently Sam builds them and sells them one at a time. He is easy to work with and is willing to change details if you ask. I'm asking to have a handle put on the top of the preamp along with an XLR output added to the unit. Here are the specs that I know: -6SL7 preamp tube (sovtek stock) -12ax7 preamp tube (JJ stock) -12au7 power tube (I know...) in a push/pull setup (NOS RCA USA stock) -EQ is passive designed after a Fender Showman/Alembic/Trace Elliot V-Type -Gain knob controls tube gain. It is very musical and has a huge effect on the tone. -Coupling knob has dented settings and controls the amount of output tube drive that is added to the signal. Pure awesome! -Range knob has dented settings and has built in EQ presets. They are subtle but luckily all very usable. -Beautifully handbuilt! SAMAMP website is: www.samamp.com. He does not list the bass preamp on there but if you want to talk to him then I'm sure he'd build you what you want. I could not be happier with this amp tone wise. I'll be the happiest I can be when I have an XLR out added to the unit so I don't have to use my direct box with it. Pics to lust after: This pic is for size reference. I like the way it looks on top of the stack!