| I started using EMGs back in the early 80s.
Some of the 80s pickups (pre quick connect) are a little different. For example, the J soapbars (35J, 40J, 45J) used to have a longer coil positioned diagonally from corner to corner. The newer ones have a smaller coil positioned like half a humbucker. I haven't tried any of the newer ones, but they might sound a little different.
Some of the early Strat pickups were wound a lot hotter, but they have trouble fitting them into the covers. So they sounded fuller than the newer ones. I don't know if this is true of the bass pickups as well.
The new X series are the ones to get though. The preamp sounds much cleaner and more open.
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