This has been my main "Go To" bass since I acquired it around 12 years ago. It started cutting out during a gig and what I thought was the jack turned out to be the pre-amp. Right now I am planning on replacing the stock preamp with an Aguilar model with a 3-band EQ. It will have a volume, mix, Stacked Bass/Treble and a mid with "Push-Pull" to shift the mid center frequency. This should fit nicely in the four positions currently occupied by a vol, tone, selector switch, and boost switch and hopefully look like it came this way from the factory. The Aguilar has a three-week backlog though. Any other suggestions for a replacement preamp? Is the Aguilar worth the wait? Also, I am kicking around the idea of either keeping or replacing the original pickups. I really have no complaints about the originals aside from getting something different just for the heck of it. I am also a little curious - does anyone know whether Yamaha used these same pickups in higher-end TRB basses? they sure look similar! I am thinking much of the TRB hardware may have found its way onto the RBX-775 and was therefore cutting into the TRB market share so they discontinued th RBX-775 and replaced it with the much cheaper (IMO) RBX-375. Just curious if this hunch is correct?