I have one of these also, unfortunately without cabinet, and only the one plug in coil set inside. Regenerative circuit with one RF.
I  have not gotten around to trying to restore this one in some decades now, which is maybe a hint to me that i shouldn’t think about

pursuing this project. I have enough projects without it. I do not have the schematic but at 4 tubes, it should go pretty quickly. I’m

sure there is a first – level description in that US military book, “Handbook of Japanese Radio Equipment” ( may not be exact title )

TM 11-227-E  ( i think ). I had to look up something recently and i found the book, actually booklet, available online.

-Hue Miller