Bass preamp shoot out for the gear nerds. There is a glaring omission, and the 44 week wait is probably the reason some of the other pres have been acquired.
Subjective shootout - For this I picked a tone that I would likely use, rather than just going with everything flat, since that's how one might use the pres. Also, I probably enjoy more dirt in the tone than some so I got the pres to grit up just beyond the point of breaking up (unless it couldn't)... I attempted to keep the output roughly the same, but you can check the meter to see what is happening for when you hear a difference.
Preamps tested:
Caveman Audio BP1 compact
Origin Effects '64 Black Panel
Jad Freer CAPO
Universal Audio Solo 610
Warm Audio WA73
Xotic Effects RC Bass Booster
and for fun
HX Stomp - Tuck n' Go preset
HX Stomp - Aqua 51 preset
into a Presonus Quantum 2 (everything into the same channel)
Basses used:
Fender Custom Shop Pino Palladino Signature w/ La Bella Flats
Mid-90s Ernie Ball Musicman Stingray 4 w/ maple fingerboard & Dunlop Superbrights
Sire P5 5-string w/ DR stainless steel rounds