I think that what you are hearing is the woofer bottoming out from some DC leakage. Not a good thing.
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Herman, this is a very short and dull "boom" that happens randomly meaning no discernable pattern. I can best describe the sound as like that of a subwoofer, but very short in duration (kind of a pop but at very low frequency). It can be heard between tracks or during, but only in silent or low passages. As far as frequency of occurance goes, it is more of a periodic nuisance than a continuous problem.
the dc leakage sounds like the problem have you tried moving the valves around that would isolate a valve issue mine had random click which disapeared when i move the left outer valve to the left inner valve position (the front ones) if you tap the front outer valves gently you will here it in the speakers that is how sensitive they are. isolate the amp much the same way as you would a turntable, valves are very suscetible to vibration mine sits on two hefty car washing sponges works a treat.