when biasing a guitaramp see post below, i accidentally shortend two points.
and now the anode voltage on my tubes is 560V , i traced the wires that i shortende and they came from the output transformer. is there a way of checking if he is all right. and what could be other problems?

i rechecked with another meter and now erverything is ok??

 

Why don't you ask the experts like I suggested, www.hoffmanamps.com the best tube amp resource that I know.