Picture Tubes
DuMont 144-9-T/14AP4
The original version of this tube, the 144-9-T, used 4000 volts on the anode, and was introduced in 1938. In 1939 the 14AP4 was introduced, which had an "accelerator" element, allowing a total of 8000 volts of anode voltage. After World War Two, DuMont introduced the K1003P4, which was designed as a replacement for the earlier tubes.
Electronics, July 1938
Electronics, April 1939
Here are some more detailed photos
Courtesy of Mike Schultz
The gun attached to the stem
RF heating of the getter