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Carvin SB4000 Owners!

Does anyone have a picture or diagram of how the pickups are wired? I took the J99A's out for a project and (temporarily. Barts on backorder) replaced them with a set of H50S's I have. I swear its wired perfectly. Passive mode works 100% but I get zero sound out of active. Checked solders. New 9Vs and made sure batts were properly put in. Active worked perfectly before I took out the J99As. No burns or scrapes on preamp. HELP PLEASE!