Wouldn't it be amusing if they fixed it so that both ran at 165F?
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It’s possible the bias is off on one or the other, or both. 165 is pretty hot. If it’s that hot at the heat sinks it’s cranking inside. Pass Labs biases their class A amps to run at about 50-55°C as a general norm. That doesn’t necessarily mean anything for your amps, just a reference. Might be worth taking a look at the bias of the amps and go from there. I would call Krell and see what they say.