MBL 9008A users

I am curious to know how hot your 9008A amps run. The heat sinks on mine get quite hot. You can place and leave your hand on the heat sinks near the rear of the amps, but if it was only a little hotter you could not. I am running them in stereo mode. They sound great, but I am curious to know if this is normal. The only reason for my concern is that I had heard that they run only moderately warm. Your experience will be greatly appreciated. Thanks in advance for your time.
Dennis