How much a PhD student in germany gets under TVoD E13(65%) contract?
What gross and net money in this case? What would be the increment?

Dunham is from Germany I think. You could primate message him if he doesn't reply to this.

Should be somewhere between 1300 and 1500€ (I think the latter). I am not working in Germany but friends of mine earn 1500€ with a 65% position as far as I know. Hope that helps.