it's easy as pie.
Gibson SG Standard + 18volt EMG-81 & 85
Mesa/Boogie Mark IV + Recto 2x12
Keeley Modded BD-2
Vox V847a
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emg actives are designed to handle 27v. what you are referring to, i believe, is the 18v mod.
all you really have to do is connect another battery in series. all it takes is some wires, an extra battery, and some time. the mod is also completely reversable if you don't feel comfortable with it.
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At first he was like...
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it's not gonna increase power. it's just gonna make it sound less compressed. no gain change at all, if that's what you were looking for. for more gain, buy a booster pedal or knob or switch and install it in your guitar.
Jackson RR5 ivory w/ EMG 81/85
Jackson DX6 w/ SD Distortion & Dimarzio Super Distortion
Fender Starcaster Sunburst
Mesa/Boogie DC-3
Johnson JT50 Mirage
Ibanez TS-9
Morley Bad Horsie 2
Boss CE-5

ISP Decimator
Boss DD-6
Korg Pitchblack