Can anyone recommend a printable label for vacuum tube boxes?

I do the same thing.. I use Brothers P-Touch for cable labels too. Pigeon ring your valves too with label tape.. Like "Tube Depot"

I mark the the TOP on the valve too, with a permanent marker. Easy to remove and clean the valve with an alcohol wipe in case it changes or you goof.. I clean the pins at the same time.. I use a cotton wad and a little WD40. I plunge the pins several times, they clean right up and get a light lube, that is conductive.

Valves are one of my OCD deals, I have to keep an eye on .. LOL

Some DANDY deals if you keep your eyes pealed.

Regards

How about Avery inkjet labels (or any other brand)?  They come in just about any size you might want, you can make a template for them or just do them one at a time on your computer and print them out.  You can probably remove them off the boxes without damaging the box, if needed.

If you want you can get original boxes for Siemens, Valvo, Mullard miniature tubes on ebay.
Only thing they have a blank space where tube type could be printed.

G

A brother p touch is very versatile. Once you get one you’ll be exploring “what can I label next?”