Well, I use a Tektronix that's rather like that (but beefier, plus it's a linear supply) for my AE system, but you'd need something that has discrete +12 and -12 outputs, and I'm going to venture a guess that that Kungber probably doesn't, despite the panel markings.
THIS, however...https://www.mouser.com/ProductDetail/Bel-Power-Solutions/HCBB-75W-AG?qs=gCHJnwMCk7Sa%2FhsO6vvSjg%3D%3D Well, it's a linear supply, outputs +12 and -12 at 1700 mA and 5 at 6A. More expensive than a switcher, too. But it's also pretty much the last power supply you'll need for this cab. And if those current specs are still too low, there's a couple of other models that up the +12 and -12V rail current.
It's also worth noting that these Bel units look an awful lot like the OEM ones that Synthesizers.com uses...