This is how your replace the power tubes in a tube guitar amplifier. It's pretty easy to do, but you do have to be careful not to get shocked (or killed) by touching the inside of the amp. Hopefully this is helpful to you.
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Please watch: "Guitar Neck Shootout: Fender vs Squier vs Mighty Mite"
https://www.youtube.com/watch?v=DgZgtRhcSIc
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