I recently picked up a wurlitzer model 40 tone cabinet. The cabinet was complete but in pretty rough shape. I have a couple questions. first off it has a pair of 6420 line amplifiers in it. What would it take to turn these into a pair of mono blocks and where would i even start with a project like that? Second is what to do with the field coil speakers? I dont want to throw them out but am not sure is there is much of a market for them? thank you for any help!