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You've got the cap right.
This is a guess off the top of my head, but I think the middle might be the cathode. Sam's usually lists pin numbers of tubes on the schematic. The tube numbers count from the key way or missing pin clock wise or counter clock wise depending on which side of the socket you are looking at. Find a pin that you know what it is based on what it is connected to look up the number on the sam's and count. Some elements on a tube have more than one pin connection (grids and cathode usually on HO Tubes). If sam's only lists one pin when two are used googleing the tubes data sheet and looking at the pin out there will give you the whole story.
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