I don’t know a lot about ‘phantom power’ but if I understand it correctly it’s mainly used for powering mics that need power to work and that power is send down the input to the mics output?

if that’s the case then I can only imagine that blasting voltage into a pedal like this won’t be good for it at all. I wonder what kind of voltage the ‘phantom power’ is… anyway I’d suspect that one or more components are fried in the big muff…. it’s repairable though, you could replace every component for not a lot of money (if you did it yourself) but that wouldn’t be a quick job so paying someone else to do it might not be worth it.

open it up and see if anything looks burnt out, blackend or whatever… you might be lucky.. post some pics if you can.

ouch 48v into the circuit!!

if you are lucky it might have just blown the output capacitor as that’s the last thing in the circuit, so the first thing the voltage would have hit.. and hopefully once that blew it might not have been able to get anywhere else… yup, open it up and have a look and let us know what you find.