> But for most op amps, that limit is up in the megahertz range, so there's no problem using them for audio. (There is an audiophile cult which denies this, of course.)
As a hobbyist who does a lot of tube audio, I'm happy and sad. Not because you're right---you're definitely right---but because I know why you bother to mention it.
I love the history and the hands on aspect of the big, clunky guitar and kit amplifier circuits of the 50s and 60s. On my time, point-to-point is so much more fun than checking IC pads under magnification. But I often feel left out. The audiophile tube babble makes me queasy, but at the same time, it's all buggy whips to any real pro.