@Whitenoise17 do you mean the non reverse thunderbird? Well I'm in the process of making upgrades on it... new pickups, trying to add a Preamp in there, new pots.... or what did you mean???
How would I Contact Bartolini directly ? TCT-B came standard in the Gibson Les Paul basses in the early-mid 90's.. I think the B stands for basses with higher output pickups .. well that's what I read here on TalkBass..