4 Pin Ceramic With Nickel Silver Bottom Chassis Mount Tube Socket For 300B, 2A3, Etc. #4001CN
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Socket is bottom chassis mount type. Nickel silver plated contacts, zinc plated mounting saddle. Nice thick ceramic; you can use this one with a .200" thick chassis top plate. The bore hole must be larger than 1.212". Screw mounting centers 1.5".