To the OP, I'm sorry to have taken this thread down the 336 path when you were asking about the 33H. ML says the 33H dissipates 360W at idle, so the pair will sink a rather spectacular 720W at 120v just sitting there and waiting for a signal. You didn't mention your speakers, but if they are relatively inefficient ones, with impedance that falls below 4 ohms a lot, you're going to be drawing well over 1000w at the outlet regularly. The advice in this thread for dedicated 20amp circuits for each 33H is not only recommended, but nearly required.
As for swapping the power cord, I know there are lots of people that claim that power cords, or even outlets, make a difference in how your system will sound. I won't argue that here, but the 33H actually self-generates it's own AC current for the voltage gain stages. This capability is massive overkill, and goes beyond anything provided by an aftermarket power cord, and beyond what's provided by all but a few super-expensive power conditioners. You have what's, arguably, the best solution for power conditioning reasonably available.