So you have a National RM-1 resophonic mandolin but it isn't loud enough? Convert it to an electric with the Hot Plate from National! Simply remobe the cover plate and install this instead. It contains a Jason Lollar pickup, tone and volume controls, and an output jack—all you need to make your RM-1 pluggable. New from National, the Hot Plate is $425; get it here for a little less. $375 plus shipping.