Hi, I'm not sure where to put this question, but I figured this is the most appropriate place. I lost a power cable to an amp, and I'm not sure if I can use any 3 prong computer cable to power it. It looks like the amp says 120VAC, 60Hz, 300 watts. I have multiple cables, 1 - 15a 125v 1 - just says 300v 1 - 10a 125v 1 - doesn't say anything that means anything to me SJT 18AWGX3C Is there a general rule? Anyone? Thanks!