I've got an old distortion pedal that doesn't have a jack, I just put a 'reverse' 9 volt clip lead onto the internal battery connector, and run the wire out the battery access panel. Most power supplies like the 'One Spot' come with an adapter connector to do that.
If your preamp only has a screw-on cover plate, you could drill a hole or slot in it for the wire.
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Mike
My music: https://mikebirchmusic.bandcamp.com
2020 Taylor 324ceBE
2017 Taylor 114ce-N
2012 Taylor 310ce
2011 Fender CD140SCE
Ibanez 12 string a/e
73(?) Epiphone 6830E 6 string
72 Fender Telecaster
Epiphone Dot Studio
Epiphone LP Jr
Chinese Strat clone
Kala baritone ukulele
Seagull 'Merlin'
Washburn Mandolin
Luna 'tatoo' a/e ukulele
antique banjolin
Squire J bass
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