Bob, are you sure that you didn't play your blowtorch over the top of the 502 before you brought your wife in to feel it? Just kidding, but if the 502 would get dangerously hot the protective circuit would shut it down. The difference between 75 watts and 120 watts, for example, is only 2dB(e.g 110dB on a momentary peak compared to 112dB)and you might never use it, depending on several factors.
If you want another receiver you might add the new HK 435 and 635(with the new auto-equalization developed by Dr. Toole's group)to your list for consideration.
