You did not check the link. The link clearly posts diagrams that confirm my pin out. Here is a Pic of the GE specification sheet for further confirmation:

You did not check the link. The link clearly posts diagrams that confirm my pin out. Here is a Pic of the GE specification sheet for further confirmation:

I double-checked the link—diagrams show heaters on 2/7, cathode on 8, plate on 1, with internal connections. Your GE pic must be cropped or from a dud edition. Link the full sheet or admit the mix-up?
Here's the full specification sheet from General Electric: