[Amps] gs-35b bias pb?

[Flo]

hi,

i'm building my first tube amp on 2m with a gs-35b grid grounded.

yesterday i made a try with the full bias circuit but when the ht (3500) 
arrives the grid meter jump quite high then the fuse of the power supply 
blown. I replace the fuse with a smaller one, i removed the bias circuit 
and i have connected a 10K resistor between the cathode and the -HT. 
Same result. I do not understand why the tube is not blocked  and why i 
have  so many current on the grid.

any idea ?

Flo F5CWU