I saw a dead thread for an older controller so I figured I would make a new post. I have a ULS-25E and it still works but I want to upgrade it with the Ruida RDC6445G controller. I saw in another post that it can be done with an older controller by just using the PWM to the center pin and outer shield to GND of the "RCA" jack on the RF tube. I was wondering if I take out the SSR and run power directly to the tube with the exception of the PWM input or is there a different way to connect the power to the tube? Also, can I change the ULS 28v PSU (considering its age) to a modern 24v or is there something special about the 28v stock PSU?

-TIA for any help!

Stock wiring

Ruida instruction manual