I just aquired an early '50's Kalamazoo amplifier which was serviced by a very good tech, but the previous owner chose to retain the original reddish-brown AC cord with a 2 prong plug. Normally, I would just have it changed out, but must admit that the original cord is in excellent condition and has a ruddish brown tone which matches the chassis so I kind of what to keep it as well. Hence the safety question. Since the chassis is housed in a wood cabinet which would not conduct electricity, one would have to contact the metal chassis to complete a circuit if there was a short. The knob is bakelite so it shouldn't conduct electricity and one could use a piece of wood to flip the on/off switch as an added precaution. That would just leave the instrument cable plugs as the risk which could could easily be avoided until the amp is powered down. I guess what I am trying to do is decide how much of a risk is there really in using this serviced amp with only a 2 prong cord? It isn't an amp that will be played a lot, but I am trying to decide if it is dumb to keep the cord? Are there any options to provide safety without replacing this cord or is there a resource that could match the original cord in a 3-wire for replacement?