[Texasrocker]

... I have also found that most old loctal-type tube pins are always corrosive, and a good way to clean them is by using a xacto-knife blade or equilavent ( olfa knife w/ snap-off blades), and take time to hand-scrape all tube pins to shiny metal appearance. Good quality contact-cleaner sprayed into tube sockets helps when re-seating tube pins several times by repeating tubes inserted in their respective sockets. Sometimes, it also helps by checking "squeeze" factor on underchassis loose tube pin connections, by carefully "tightening" those loose socket pin connections with needlenose pliers with tube out of socket. Be careful to not apply too-much pressure with pliers!! Loctal type tubes are notorius for not making good pin connections, opposite of what they were originally designed for!