Audion thermionic triode valve

Made:
1906 in United States
maker:
Lee De

Audion thermionic triode valve by De Forest

One of the first valves to have a grid

Details

Category:
Radio Communication
Object Number:
Y7001.601
Materials:
glass and metal (unknown)
Measurements:
overall: 102 mm 23 mm,
type:
thermionic valve and triode valve