The basic problem is that no sounds comes out (if cranked totally to the max you can hear a very very low signal coming out of the speakers, something impercettible).
-I've checked the pre-amp stage running it into another amp from the fx out and it works fine.(so the problem should be in the output stage)
-Once opened the amp for ispection I've found two big caps that are litteraly desoldered, one of these looked damaged so I've changed them both. Anyway the problem isn't solved yet, still no sound.
- With a better inspection of the bottom of the pcb I've found that just under some big resistors (I presume they are for the output stage) there's an orange halo, something like when you heat PCBs and the protective coat burns away, the whole area under them looks browned too..the resistors look good anyway, they doesn't show any damage, I could change them but maybe I won't solve the problem..
I've already tested them with a multimeter, it says 0.00 when I connect the two plugs..but since I'm new about checking resistors with a mutlimeter I'm not sure if I'm right..I've tried measuring small .25W resistors and I can measure them all, but this big ones always say 0.00 to me..
BTW
My question is: Is it safe to check all the circuit with the meter while the amp is under power as I usually do when I get problems with stompboxes?
)..so I've checked the amp and I get fried.. 
, I was suspecting that going in that way is dangerous..but just to be sure.. 
