With the 845 tube you have a nipple protruding from the side just above the pins to assist with installing the tube
Is it ok to use the tube if the nipple is missing?
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As long as the pins are there and intact you are fine that is just a guide to help you place them more easily.
You don't need the side nipple but you still need to respect the tube orientation to ensure that you have the right pin aligned with the right conductor.