Hi TGP, Aside from volume or tone impacts, what actual risks are there to running a 6g6 Bassman head (4 ohm output) into a Marshall 4X12 cab (16ohms). Is the potential risk to the speakers, tubes, or the transformers, or both... I have seen many people power marshall 4X12's with bassman, but I don't want to F up my 6G6. I have run the bassman into 8ohm cabs many times. These old bassman seem pretty bullet proof, but I don't want to destroy my amp Second question... Is it more risky to run a 16ohm amp into a 4ohm cab? Any insight would be much appreciated.