I do not yet know the vintage of this grid bias battery. I only presume that it is from the late 1920s.

I would very much like to see photographs of similar G.E.C. 'B' Batteries.

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The sockets are simply brass tubing
with an INSIDE diameter of 1/8". The
mounting is simply a piece of
fiberglass printed circuit board
material.

The light green block is my fixture for
cutting the brass tubing with a very fine
jewelers hack saw.

       
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