During a recent visit to China we dropped by the Shuguang tube factory located in the city of Changsha, Province of Hunan. On every visit to the factory we ask to take photos and video and they usually say no or limit what is captured. However, each time they relent a little more and this time we captured some of the manufacturing process of their EL34B tube production line. The following three videos show the behind the scenes process of building the EL34 vacuum tube from start to finish. This process is very similar to most common vacuum tube types in production today.
Part one shows workers meticulously constructing the internal assembly.
In part two things really get hot as they turn up the heat for the bottle sealing phase.
Finally we end with flashing of the getter which completes the vacuum tube production process.