Perhaps the pre stage is class A circuitry? I use a Harmon Kardon AVR7200 as a pre and it runs very hot.
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Thanks to Shiva as well. After talking to a certiied Onkyo Tech i only became more confused He said you cannot trim the bias but he could add a couple of circuits so it runs cooler this makes no sense to change the design to repair a fault that doesn't exist! I know i should just listen. Thanks to all.