Here is good advice, always turn your gear off when changing out rca cords. The other night i was changing out my rca's from my source to pre. Took the rca out of my pre and dropped it, with it live hanging from my bda. Well to my dismay i heard a noise that was extremely electrical and the kind you do not want to hear. I picked up my rca and the rca plug was black. Was able to clean off the char and the plug was only slight damaged.
Everything still works but it was a real heart stopper there for a second. Thats the first time anything like that has happend to me in decades of doing this.
If anything i think it was my 14B that offered protection. I think it came in contact with my other rca plugged into the 14B