Add up the wattage of each of your components: then if it is less than 1,300 watts your OK.
My Bryston 4B-SST2 andBP-26, BP1.5, several digital components, and two powerline conditioners, uses an average of 600 watts. (this is the utility bill calculation with stereo on, but not always playing 24/7.
So 600 watts is well within a 13 amp circuit, and I have a LOT of stuff turned on and connected.