I just found out that my mother´s Prologue One bought in 2005, has a different driver board than the one in the manual I can download from PrimaLuna´s website. For what I can guess, it does not have the plate fuse, neither the so publicized Adaptive AutoBias. :/
This is the only picture I could find similar to mine:
All other reference to the board is like this one:
I opened it, because three tubes went dark, so I tried to check the plate fuse following manual instructions, to come across this discovery...
Anyone knows what is going on here?
Thanks
