I use Nichicon capacitor power supplies from this vendor and they all work great. They have one for the Jaguar as well.
https://www.retrogamecave.com/
(Personally use: nes, snes, genesis/32x combo, jaguar, 2600 from this vendor)
If anyone is interested, this user is selling 5200 prototype carts on ebay:
https://www.ebay.com/sch/boring.oregon.ranch/m.html?item=224656427787&rt=nc&_trksid=p2047675.l2562