Octal connector
In some Tektronix equipment such as the 160 series, an octal connector is used.
The plug resembles the bottom of a tube like a 6L6. The socket is an octal tube socket.
The 160 power supply has octal sockets on the back, and octal cables bring the power to the modules such as the 161, 162, 163, and 360.
Used in
Pictures
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Modern octal cable plug
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Octal power sockets on 160 series modules