I guess some of you don't realize how heat sinks work. They cool the amp by natural convection which means VERITCAL air flow around the fins. If you put blocks under (or over) the fins, you are destroying the convective flow and raising the sink temperatures exponentially. Your hand my not feel a big difference but your transistors will.
I would contact Classe and see what they have to say about this problem. If they aren't helpful, you may want to try loosening the heatsinks just a little teeny bit. It may be tough to get at mounting screws but if you can, loosen them a very little bit - no more than half a turn or else your thermal resistance from case to sink will rise too much. In no way should the sinks feel loose at all after this - if so tighten them back up some. Otherwise, you may be able to think of a way of cramming a thin piece of metal between every other pair of fins that wouldn't obstruct airflow appreciably but puts the fins in a bind. Anyway, for such an expensive amp, Classe should tell you how to fix it. I wouldn't accept no for an answer. Good luck - Arthur
I would contact Classe and see what they have to say about this problem. If they aren't helpful, you may want to try loosening the heatsinks just a little teeny bit. It may be tough to get at mounting screws but if you can, loosen them a very little bit - no more than half a turn or else your thermal resistance from case to sink will rise too much. In no way should the sinks feel loose at all after this - if so tighten them back up some. Otherwise, you may be able to think of a way of cramming a thin piece of metal between every other pair of fins that wouldn't obstruct airflow appreciably but puts the fins in a bind. Anyway, for such an expensive amp, Classe should tell you how to fix it. I wouldn't accept no for an answer. Good luck - Arthur