CTC-5 No luminance.

[Electronic M]

I've had sockets where a few pins no longer were in contact with the remaining phenolic....I was still able to plug tubes into them and have the set work fine.
Electricity don't care how good something looks or how complete the mechanics are, as long as the paths it is supposed to follow are conductive and the ones it is not supposed to follow are not conductive, it will keep flowing the same way it has for decades.

Just be careful not to bend the socket contacts when removing and inserting the tube and it should be fine.