Now install a new trimmer and make a first test without tube.
When i put a 47ohm resistor between pin 4 and 7 i can bias the heater voltage to 6,3v.
Also changed the 25k trimmer. Still the lowest point for B+ is 123v. I can't go lower.
Well, when I now connect the Mic to the PSU I get following voltages. (As I said, I test it without tube, don't know whether it can work).
Now I get between HG and...
K=0v
A=27,26v
H+= -63,1v (why minus?)
Fgrid=0v
On r9 I get 27,71v and on r11 -27,49v (

).
I check my wiring, it seams everything alright as far as I can see and check with my continuity tester.
I don't think that the tube inside will change something.
I'm a bit confused now.
appreciate every help