Ok, so right now I've got some Nordy Fat Stacks and a Seymour Duncan preamp in my 55-01. I like the Nordy's, but I feel like the SD preamp is a bit... modern? Some of the tones I get are kind of reminding me of a Spector, which I'm not a fan of at all tonally. I was hoping someone here could recommend me a good preamp that has a push/pull for active/passive to go with the Fat Stacks. Or, if I should maybe consider other Nordy pickups based on what I like. Well, to put it shortly, I've only ever had 1 P-Bass, but I really like the way it sounded with flats. That's the kind of tone I'm a fan of. I strung the 55-01 with flats, but I'm not getting that vibe at all. I've never really looked into changing preamps or anything, so I'm a total noob at this. If anyone can recommend me a preamp that can give me some sounds similar to what I've asked for, I'd be really happy.