N
N_Cook
Thinking back to the original failure mode. Solder joints all looked ok ,
but this is definitely PbF although absolutely no mention anywhere. The
holes in the pcb, for the powerfets , although plated through, are 3 times
the required diameter of the width of the powerFET pins and no eyelets
padding out. If bias to a gate failed then that could easily short circuit
that mosfet, would the other one fail soon after, if the amp is in use at
the time.
but this is definitely PbF although absolutely no mention anywhere. The
holes in the pcb, for the powerfets , although plated through, are 3 times
the required diameter of the width of the powerFET pins and no eyelets
padding out. If bias to a gate failed then that could easily short circuit
that mosfet, would the other one fail soon after, if the amp is in use at
the time.