according to marshall its an 81 and under a hundred of them were made, so definatly quite rare.
people do some rather stupid things with valve amps, makes you wonder where the myth of them being fragile came from. I've seen people bypass fuses by wrapping them in tin foil which has led to some nice consiquences!
Sounds like a DR405.
Wrapping fuses in tin foil.... what a stoopit idea....
