I'm the Proud Owner of a well historied Carl Thompson that is still in fairly original condition. (The Baldini Bass, which was owned by Don Baldini, AKA Don Baldwin.) See this thread for some history & Pics... http://www.talkbass.com/forum/f8/1975-don-baldwin-baldini-bass-carl-thompson-685866/ It came with Schaller humbucking pickups wired passively. There are 3-way toggles wired for Parallel/Mute/Series, and 3 controls, Vol/Vol/Tone. The pickups are about shot, and at least one of the controls has been replaced already, and another is really scratchy, even after being cleaned and lubed. My thoughts are to have the pickups replaced with the same pickups if I can find them, or have the originals rewound. Or! I have a 1991 Les Paul bass, which for all intents & purposes (Intensive Purposes?) is a Les Paul Shaped Thunderbird. Passive MudBuckers with Vol/Vol/Tone controls. I upgraded the pickups in the LP with Bartolini Classic Sound units, and had each wired with a 3-way toggle giving them Series/SingleCoil/Parallel settings. The bass sounds AMAZING! (Very Roscoe Beck!) It would require a Hint of Routing to get the slightly larger Bartolini units to fit the body, but the 3 tone controls and the 2 toggles are already there, just waiting to be wired in. (I would replace the Pots & Toggles as well!) I have a Very Skilled luthier that will accomodate me with either decision. What would you do if this Storied Instrument were in your hands?