Do amps need time to break in? my hpa-2

I have a proceed amp-3 and just bought a proceed hpa-2 the amp three sounds like a proceed should. but the new hpa-2 sounds a little harsh and grainy on the top end.... whats up with that... if i wanted i would have kept my adcom ? someone help me out with this damn thing get better with time or not? Thanks Lee Lexicon DC-1 (yea i know) B&W Nautilus 803, HTM1, 805 Proceed amp-3 Proceed hpa-2 Mit MH-750 Shotgun Bi-wires (yea i know)