Also, the methods used to determine power outputs are a little suspect, not unlike automobile engines were before 1971. A close read of the specs of a 1000 watt amplifier might reveal that it really puts out only 250 watts into an 8 ohm speaker. That 1000 watts was at 2 ohms, or unloaded, or whatever, no one knew how manufacturers did their testing.
Tube amps are often driven at maximum output or even pushed a bit over so they then achieve a pleasant distortion. An overdriven solid-state amp does not work as well, so they are usually designed to be used well under maximum output. Distortion can be added though either on board or external effects. Obviously this is not quite the same sound as an overdriven tube. This is why many audiophiles are willing to pay a premium for tube amplifiers that use 50 + year old technology for a “warmer”, “fuller” sound.
In conclusion, tube amps are cool. I’ve used tubed gear since getting into audio in the mid 70′s and even back then thought the sound was more to my liking than solid state. They each have a different sound, especially when pushed hard. Transistors are more practical, more reliable, and can produce huge amounts of power with relative little weight or money. There is clearly a place for both in today’s musical world and for the vast array of speakers in today’s market.