I remembered reading sometime back that the power for a tube amp is equivalent to double that in a solid state amp. So for eg. a tube amp with 40watts is equal in power to a solid state amp of 80watts.
Those meters on the old school receivers were(with few exceptions) NOT peak reading meters. They only showed average power output. Peak outputs easily exceed 10X the average output for a given listening level.
Kjweisner- For a better understanding of how Watts, DB and perceived loudness relate, read this: (http://www.gcaudio.com/resources/howtos/voltageloudness.html)
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