On Thu, 9 Nov 2017 11:14:39 -0500, 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)

Tube testers came as

Filament test

Emission (basically see some plate current)

Gas (grid current)

Shorts

"Mutual conductance" with real AC signals


There were transistor testers for a while, but they went away.


--

John Larkin Highland Technology, Inc
picosecond timing precision measurement

jlarkin att highlandtechnology dott com
http://www.highlandtechnology.com