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Guitars aren't "powered" by electrical mains. They
use the induction of the string crossing into the magnetic field of the
pickup. I've only measured about .5 Volt output from my guitars and I'm
sure the amperage is quite low. It would be much worse to get a 9v battery
on your tongue.
If you're using a tube amp, some with 450 V biasing
voltage, if you had a shorted input capacitor you could possibly get that
voltage at the guitar but I don't think the guitar lead(cable) would handle
it.
t
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