Ok, the output from the pick up in my jack casady bass is according to epiphone 6K. but im finding despite the fact its meant to be a good pick up, it's very wooly and lacking any bite. It's a humbucker but a weird size. The only pick up i can find so far that will fit in the hole is a single coil seymour duncan pick up for a precision rated at 14.5K also they do a rickenbacker pick up that'll fit. Bartolini do one also, but ive not found out the output's yet.