Evacuating and melting down vacuum tubes

Evacuating and melting down vacuum tubes

Vacuum tubes are made up of an inner and outer tube with different diameters. The two tubes are shaped sequentially on one side of the base. The outer tube is then fitted with a pump port for subsequent evacuation. A getter is inserted into the outer tube so that a better vacuum can later be achieved. The inner tube is slid into the outer tube, where getter springs hold it perfectly centred.

The two open ends of the tubes are melted fused together, whereupon the two tubes are placed vertically into a heating pipe; the pump port is connected to the bottom of the vacuum pipe. The tube is then evacuated while a temperature curve is simultaneously being run in the heating tube. The melting spigot is activated while the tube cools down, and the pump port is closed

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