I really like running stuff into my Marantz PMD-221 and then recording both the line out and an SM-57 on its little speaker, lining them up with a little labs IBP phase plugin (though you can easily do it in other ways too…like just zooming in and lining them up in the daw after they’ve recorded). I’ve been experimenting with multiple passes for stereo (one for left, one for right) too.
When you have two parallel signals (3 if you count the raw), you can do all sorts of cool stuff…especially fun to do it over time. Fade them in and out to change the quality over time. Pan them.
I also do this by running stuff into my AC30, and then recording both a 57 and a ribbon mic on the cab. Sometimes I just create a mix of the signals (which IMO, is my standard for an electric guitar sound) but you can also do the automating fades/pans/etc. stuff.
I need to do more experiments with running two similar but slightly different signals into my warps module to start messing around with them in there.
Also reminds me that I need to find the tiny little wear-on-your-belt battery-powered amp my parents got me when I was kid and try recording that.