Hi guys, Have a friend with one of RM Italy boxes. Don't have the model # on hand but it's one their typical smaller ones. It's not the little 203, but like the next size up, longer and red in color, 200W range. The preamp transistor failed and I replaced with same for him. Is a BF199. It worked about a month and failed again. I had picked up a Lot of 10 of them so I popped another one in and off he goes. So if this one fails then it is likely apparently that there is something going bad elsewhere in the circuit causing this transistor to fail. - OR, there is the possibility that this part was poorly selected for this part of the circuit and would benefit from a heavier duty one. Has anyone here experienced the same problem and know the fix? Or can anyone suggest a heavier duty replacement for the BF199 that we can try? Thanks !!