Now you got me wondering.
I never took notice of that i.c. designation on the tube datasheet.
So I pulled out an EL84.
Pin 6 appears to be attached to the mica insulating spacer.
So that does not look as if it would take out a tube, if pin 7 (plate) "touched" it.
It appears that all of the pin connections pass through one or the other of the mica spacers.