Original TELEFUNKEN EF14metal tube this is a 6,3V filament version of extremely rare an expensive VF14 tube used in Neumann U47 microphone Vacuum Pentode RF/IF-Stage made by TELEFUNKEN GERMANY in 1950s The tube is probably used, tested with the great results: tube 1 Ia = 16,5mA (137%) where 100% for the new tube is 12mAthe tube is commonly used nowadays in a lot of Neumann Telefunken U47 clone microphonesFlea 47Wunder Audio CM7Telefunken Elektroakustik U47MDIY microphones the tube is in a great technical shape. the tube has German Steel base Y8A you will get the tube you can see at the pictures I always send the tubes by priority registered mail with tracking number within hours after receiving payment Santic [feat. Vera Hall] – Trouble So Hard