According to his Bio:
Twiggy Ramirez: Bass
Gibson Thunderbird basses (5, in standard, drop D, and drop B tunings)
Ampeg SVT-2PRO amp heads (3)
Ampeg 4×10 (3) and 1×15 cabinets (3)
Dunlop overdrive, distortion, and wah pedals
Whirlwind Multiselector
Samson 660 Wireless
Behringer SNR2000 Denoiser gate
http://www.funksheet.com/2012/07/mar...gear-2012.html