The new amplifiers is getting warmer and hot

Why the newer amplifiers / AV Processors and receivers is getting more warmer and hotter than the older versions ?
i have 2 1990s amps citation 7.1 and harman Kardon signature 1.5  runs cool compared with my current Parasound A21+
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Showing 1 response by millercarbon

Talk about comparing apples with oranges! What AVR from the 1970's are you thinking of?