NOTES
* I do not yet know any correct designation for this tube base type; "Euro Grid" is a name I made up.
Both pins indicated above as "A" are connected internally to the anode mesh.
All known sockets and datasheets for tubes with this base type do not have a pin numbering scheme; pin functions are used exclusively. I made up the numbering shown here for my convenience.
Arrow points away from tube outline indicating top of symbols for end-viewed tubes, points toward tube outline indicating direction of viewing for side-viewed tubes.
Pins are shown as looking at the base of the tube; i.e. "bottom view".