In article ,
"Tim Williams" writes:
"Fred Nachbaur" wrote in message
...
It's quite a different scenario in octal tubes, where the socket is
separate from the bulb, and on which "NC" pins truly do not even connect
to any of the wires coming from the bulb.

Especially with sockets with missing pins

Tim

Even then- I've seen some (usu. rectifier) tubes with a missing pin,
then other tubes of the same type with that pin present but apparently(??)
not internally connected. But then, as was previously stated, it may
be connected to the getter, or to some support structure, or ???

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Marty Dippel High Energy Physics
Sr. Systems Analyst The University of Chicago