ETF - Manufacturing a 14AP4

Manufacturing a 14AP4 Picture Tube

These pictures and text appeared in magazine articles in 1939

Blowing the bulbs by hand

Trimming excess phosphor from sides of 14AP4 picture tube

Inspecting the tube for defects

The steps in making the electron Gun

Installing the gun

Fusing the gun to the tube

Sealing off the tube after heating and evacuating

RF heating of the getter

Pressure testing the completed tube

Here are some more detailed photos (courtesy of Mike Schultz)

The gun attached to the stem

RF heating of the getter

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