Hi Petter.Glad to hear from you.
I think I remembered an old rule for tubes that the 1 was first left view from bottom.Don't know if it makes clear or not, but...I am not so tubed
I think you could see the filaments at the center of the tube,should be 4 5 with 6.3V
Sometimes the common is not specified to inside tube for a 12V operation
OUUUPPSS !

irate:
Hope you won't burn anything....