I added a short page on tube rolling and how it may or may not affect an amp. It will probably still get a little polish and maybe some elaborations, so please let me know if it leaves you with more questions or confusion!
tubes for the noobs in us all
wauwatosa tube factory 
I am generally always confused but that is just because my learning curve is much like the average plate characteristics chart😀
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That’s ok. The steepest curves (low Rp) tend to sound great 🙂
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