To be honest, you will struggle with this on PSUD.
It splits into four series/parallel filters which PSUD can't model and there's no future plans to add this functionality as it's way outside of the design brief. Personally, if I was doing this, I'd head straight to LTSpice which would do a great job of modelling this supply.
There's some advice on using LTSpice with valves/tubes here ->?
It shows a triode but the principle is the same if you want to make up a rectifier, just less pins. You'll find SPICE models for the 5U4 rectifier here ->?
Hope this is some help to you.
Regards,
Duncan
