Just got it back from my tech. My Thumb5 BO had developed a noisy preamp, -I found that new pre's from Warwick are over $500!!!! (you have to buy all the controls). I went with an EMG stacked Bass/Treble control (I had one I bought from a going out of business music store a few years ago). It took a new volume pot but re-used the stock blend pot and of course the stock pickups. I had read here that the EMG had a better sounding bass control, and I have to agree, to me it sounds a a bit more full in the low-low end, like maybe it boosts a lower frequency than the Warwick pre did? Anyway, I'm happy to have spent less $$ and have a tone that's more to my taste.