Crank your AC15 and play it in the basement, it will destroy your hearing pretty fast without protection. I used to take a homemade 5W amp outside and hear it echo in the woods. Fun times. Quick math—the Vox AC15 has speakers with around 100 dB SPL@1m,1W sensitivity, so if you’re cranked then it’s +24dB, and if you’re 2m away then that’s -12dB, and that’s 112 dB SPL, somewhere around “car horn” or “chainsaw” on the loudness chart. Medical literature puts it at under 1 minute before permanent hearing damage.

It’s not like a stereo where 15W is weak. A 15W guitar amp is pretty damn loud.

If you don’t crank it then I don’t see the point. Or don’t hear it, anyway. I can’t stand the sound of a clean Vox. It’s gotta have some grit.

I’d really like a citation on the medical literature portion of your comment.

I am under the impression I am well read on this topic, and I don’t recognize that claim.

Why would you need to crank it at all? That amp is gonna sound fantastic at half volume. For grit they make excellent overdrives these days.

It takes all kinds. If you’re running your tube amp below breakup, you might as well just use a solid state amp. It’s only under overdrive conditions that you get compression. Outside overdrive conditions, there is not really any clue that you are using a tube amp. Mostly linear is mostly linear.

It could be that you just like the volume. The speakers in the AC15 are fantastic. Or it could be you don’t think of it as gritty, but I do.