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just to cover all the bases, wiggle tubes, if not done already, clean tube pins, I use a brass brush on the pins, spray with some electronic cleaner (the pins) and then insert and remove several times into the sockets to clean the sockets (dont just go spaying cleaner all over the socket, it gets everywhere when you do that). You can also use small dental brushes soaked with the same cleaner and work them into the tube sockets.
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