Need help rehousing a mini q-tron power supply question

[B_of_H]

Long story short I bought a mini q-tron 10 years ago and intended to rehouse it and mod it for true bypass. I took it apart and never got around to putting it back together. can I hook up the dc jack like normal or do I need to do reverse the polarity etc... I'm super rusty on all this stuff, its been many years since I got the soldering iron out.