Tube Amp Watts and Quality Electrons. LOL

Tube amps tend to soft clip which allows them to seemingly go louder with less distortion per watt than most SS.

I love tube equipment and even the tubes themselves, which I collect, but other than what Mapman said, "tube watts" are no different than anyother watt.
Yes there is a current myth that a tube watt is more powerful than an SS watt. Clearly that is silly, physical definitions pertain to audio as much as any other thing.
I do think Mapman nailed it however, if you want an explanation.

To elaborate on Mapman's answer... since tube amps soft clip they can be played at a higher average level since their clipping distortion will not usually destroy speaker drivers (normally tweeters). And many users of tube amps routinely drive them past their clipping points and then contend that "tube watts" are more powerful than "SS watts".

When a transistor amp clips not only is the sound harsher, but the type of distortion produced often will fry tweeters and sometimes other drivers. By the time you hear obvious distortion it is often too late. So greater care must be taken when dealing with the maximum power limits of solid-state amps although I believe some of the Class-D digital amps also clip softly (more like tubes).

With analog solid-state amps it's better to have too much power than too little power so that you never need to drive the amp past its rated power into potentially damaging distortion.

Makes sense guys. Although I've read or heard that if a tube amp is abused beyond the point of all reason, it could oscillate and throw off some damaging signals.

My tube amp's rated output is about 120+ wpc. Honestly, . . . . I can't push it too hard because the SPL hurts my ears.

I assumed the reference to tube power had nothing to do with the quality of the electrons.

Happy Holidays!