This is a graphic that was found on the French Wikipedia and listed there as GFDL. I have cut away the explanatory text in lieu of translating it. The is also under GFDL. This pinout applies to most of the Beam Power tubes, notably the 6V6, 6L6, and 50L6: 1: No connection 2: Heater filament 3: Anode 4: Screen 5: Grid 6: No connection 7: Heater filament 8: Cathode.