electrically conductive terminal post, extending backward axially from the first shoulder, spaced from the first axis, having a front end adapted for electrical connection to an electrical conductor of the gas discharge tube when the first end of the envelope is in the first opening, and a back end, a first wall extending backward axially from the first shoulder adjacent to and spaced from the first terminal post, a lateral second shoulder on the first wall, spaced back from the back end of the first terminal post, a second electrically conductive terminal post, extending axially from the second shoulder, spaced from the first axis and from the first post, having a front end adapted for electrical connection to an electrical conductor of the gas discharge tube when thefirst end of the envelope is in the opening, a back end, and a lateral protrusion on the back end of the second terminal post,
the socket comprising:
a second electrically non conductive body comprising a front, a back and a second axis extending through the front and the back, a lateral third shoulder, spaced from the back of the second body, a second wall extending axially forward from the third shoulder, spaced from the second axis, a first passageway in the back of the second body extending axially through the third shoulder spaced from the second axis, a wall of the first passageway extending from the third shoulder in a groove in the second wall axially along the second wall, first electrical contact slidably mounted in the first passageway