BSM connector
Several Tektronix products use BSM connectors, such as the 7T11, 3S2, S-50. S-51, and S-52. These look like minature BNC connectors. They are much less common than BNC connectors. There are two-lug variants and three-lug variants. Tektronix used the two-lug variant.
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BSM female on front lower right of 7T11
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BSM to BNC adapters