[pcyeh]

I finished replacing the caps in my Fisher 500c by Blackgates and Auricaps. After buring in for two weeks, the sound is very good

. However, I still want to further improve the sound by replacing the 40 years old unpolarized power cable. I want to replace it by a three-way polarized power cable (I don't know if I call it right

), but I don't know which pin should be connected to which part of the 500c. I read some post on the forum saying that the ground pin should be connected to the chassis ground. But my friend told me that this could cause a disaster once there is a huge power surge such that the ground has a negative voltage of very large amplitude. I don't know if his theory make sense or not

. Could anyone give me some direction about how to install a three-way polarized power cable on the vintage machine like 500c? Thank you very much!!: