[etech]

There is a little nib or protrusion on the base of every loctal tube, If you rock the tube in that direction, it should come out without damaging the tube or the socket.

This is true. Many people are unaware that the loctal tube is locked in the socket, hence the name 'loctal'.

FWIW, it is absolutely necessary to tilt or rock the tube in the direction of the 'nib' to unlock and remove the tube without damaging the socket.

Best regards,

Ed