I recently got a chance to try one out. I was quite familiar with the OBP3, as I used to have one installed on one of my previous basses. I was quite sure about its capabilities as a preamp, but to my surprise, I was blown away by the overdrive section. It's got the character of an all-tube SVT with the gain knob past the "breaking point" of the tubes. Thick and creamy with serious grind if needed!!! Mated perfectly with my 4001V63.
I've tried out a lot of drive units in the past, most of them not pleasing me at all. I've eventually settled on the TC Electronic Vintage Bass Distortion, which is a very versatile drive unit with fuzzy character and a wet/dry mix feature. But the overdrive on the Tone Hammer definitely nailed it for me. Now the TC is gone and I use the Tone Hammer as an "overdrive with a great 3-band EQ"
Highly recommended for overdriven Rick enthusiasts...
