I run a fairly basic rig to get more of an old school tone. Precision with flats into a Polytune, Spark Booster and then into a MarkBass combo. I also use a Radial DI box.
I'm looking for edge of breakup/very low gain valve tones. Is there anything out there that beats the Spark Booster for this?
I have tried:
Xotic BB Bass Preamp
SolidGold Beta Mk II
Bearfoot Blueberry
Phat Phuk B
Way Huge Green Rhino
The Spark Booster is the one I've always preferred. I predominantly use it on the 'clean' setting.