While I know nothing about Sony's receivers of any genre, I can comment on their last set of ES integrated amps and power amps. They are full MOSFET amps that run class A up to about 15wpc and then switch over into class A/B. I recently replaced my TA-F808ES integrated (100wpc @ 8 ohms) with the TA-N90ES power amp with the same ratings. Only difference I am aware of is the at the power amp is balanced while the integrated is not. Both run every bit as hot at idle or under light load as they do under heavy playing conditions. If your receiver does not run fairly warm then it is obviously not the same design. And I can't believe that it is, in any event. The integrated amp weighs 54 pounds and the power amp weighs 48. Very large x-former and caps as well as heat sinks, etc. Both are quite substantial beasts. And they sound great!! Like a BAT VK-200 for 1/4 the price.
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