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What I do, when there is an intermittant connection or the board/tube socket is burned, is to desolder and remove the old socket, then take a good quality chassis mount socket, and solder about 6" of bare wire to each pin. Then, I run the bare wires through the corresponding holes in the circuit board and solder them to a good connection point further back each PC trace that went to the original socket. The new socket then sits on top of the board, making the tube a little higher. This is not esthetically elegant, but it really works. It will work even when the board is totally burned under the tube socket. The method makes sure that there is a positive connection to each pin rather that relying on the burned-up PC board solder pad at the old socket. Yes, heat travels back down through the pins and can cause micro-cracks in the solder connection and therefore open circuits---also heat can destroy cheap plastic PC mount tube sockets.
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