Steve Deckert
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There are two things that cause this problem; inserting tubes with crooked or bent pins and or using EI gold plated pin tubes. The diameter of these gold plated pins is larger than spec, so once these tubes are used regular tubes will be loose.
If you have a small enough tool (like a miniature ice pick) you can close the pin contacts again from the top of the socket by carefully inserting the pick between the outside of the contact and the ceramic.
Otherwise, the best thing to do would be to have the socket replaced.
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