I’m not sure is worth to change the PUs and Electronics (Must change both in TRBs) , I also flirted on change before, I tired Bartolini equipped TRB II, it was very good, but very “standard” modern bass sound, like thousand of other models on the market.... TRB has it’s own unmistakeable sound character, I like it more and more every day, the high end spectrum like no other, very, clean, dominant, hi-fi like, but never harsh, not presence-full, but more “airy”....It’s a Classic, like MM, J bass, P bass, Rickenbacker etc...Sound engineers like it so much too...Just Listen Dani Alderson with his TRB 6 II with Yellow Jacket Band, it can it can produce a Patitucci like sound too, I think this Basses share a lot of features and character with his TRB model....