There's some resources which should help with this. You will need a data sheet (that's a must) but once you have this, the process is quite simple; there's a YouTube video which describes the process in some detail and some spreadsheets in the files area which help.
The YouTube video is at ->?
There's a couple of spreadsheet files here in groups.io that help with solid state and vacuum tube rectifier modelling ->?
/g/duncanampspsud/files/documentationHope this helps.
Regards,
Duncan
