I put a John East pre amp into my EB Musicman Stingray 3 band eq about 8 yrs ago, kept the original but never swapped back. Lots of versatility. Easy to fit although when I did mine, following the instructions to the letter, it said I should have a green wire last to connect but all I had was a black wire. I knew where it must go so fit it. Everything fine. I emailed JE and he said ‘ Sorry, we knew about that, but haven’t changed the instruction sheet yet’.