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12.4. Install all tubes on the same height. Level tubes that they stand straight. After inserting a tube
leads into the board, solder its two opposite leads first. This will hold the tube in place. Look at it
carefully to check it proper height and reciprocal arrangement. It is important that tubes will not
inclined to the sides. If not, it is easy to heat one or both leads and adjust the relevant tube. Only if
everythis correct, solder the rest leads from opposite PCB side.
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