Here's a famous brand of tube/valve amp, that many might recognise.
Used by "Luddite" musicians and bands the world over.
This is all serious stuff, and not just some novelty "toobed" PC mainboard or soundbar.
In a good design and built well, tubes (valves) offer some interesting advantages for audio applications.
In the specs game, tubes lose - harmonic distortion alone is measured in full percentage points, not hundredths or thousandths.
But they almost always produce that in even harmonics where the ear can't tell, and virtually nothing odd where the ear is highly sensitive.
Plus when overdriven to clipping (as happens most of the time for us, it doesn't need to be cranked), tubes will tend to attenuate and compress the signal but still match the waveform. Transistors tend to just stop producing the waveform and dump DC current until they recover.
Those electrical characteristics are the cause of what listeners call "that warm tube sound" - because music punctuated by DC sounds harsh.
You can build transistor amps that are their equal but both are very expensive.
And the big problem is that with the transistors being a better whole-market solution, good tubes can be hard to find.
Given that tubes have also been used for microwave relays, and that's an ultra high speed thing, there's no reason that you couldn't build a 4k tube TV.
But it would be hotter than the stove and cost more than I want to imagine.
(See what I did there?

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