Forgot to mention about the Power Base Mini, they have two versions of it available at Stonegaegamer. One is just a regular converter (the one I got) & the other supports the mod-less FM sound support. My Retron 5 supports the FM chip so all I needed was the regular for it. If you use on a Genny get the FM supported version if you want the better sound.
https://www.stoneagegamer.com/powerbase-mini.html
https://www.stoneagegamer.com/powerbase-mini-fm.html
https://www.stoneagegamer.com/powerbase-mini.html
https://www.stoneagegamer.com/powerbase-mini-fm.html