bitrex wrote:
Not exactly a sophisticated piece of test equipment, but lets you eject
bad metal enclosure tubes early:

https://www.dropbox.com/s/m5b4ogl4pqn8tu1/IMG_20171109_110954264.jpg?dl=0

(all the metal tubes in the 1935 table radio passed)


A common as dirt filament tester. They were common as dirt, and sold
for about $3 in the early '60s. They hyped as real tube testers.