Noob question: how do you mark a tube?

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Mr.P

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I have a bunch of jj ecc83s, which look virtually identical. But I prefer the sound of some than others, how can I safely mark a tube? Can I put a sticker, or write on the glass?
 
Sharpie is fine on the base or the glass. It'll rub off of the glass pretty easily, though.
 
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