Thanks Maurillo. The Pedulla Pre is different i think, it has only bass treble and a boost switch. The boost switch does no let you choose the frequency, its just up on down of, or the other way if you turn the two blue trimmers in the opposite way. What it does, is dip or boost on a certain frequency. exept for the NTMB 918, there is a other small black square box with no letters on it, I guess thats the Pedulla custom part of the preamp. I would have to guess and try if the colors corespond to the bart sheet. I would not want to kill it.