hey there everyone.

Im gonna be replacing all the tubes in my amp. for the Preamp tubes im gunna use in the first stage, a mesa 12ax7, and im going with Groove tube 12ax7s after that. i'll be using 4 mesa 6l6's in my power amp section, and im going to be doing the bias mod(which i happened to find a tut. to if anyone wants the link).

Im just wondering, what do i do to make sure i dont DIE when i put in the tubes?
turn off the amp?
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drain the filter caps

EDIT and i reccomend using JJ's from eurotubes.com instead of mesa tubes
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It seems like the tutorial would have everything you need, but if you are unsure, take it to a pro.
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