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Bases and chimneys
Triodes
Tetrodes
Pentodes
Electronics and computers
Y799
YC156
Yagi-Uda

Browse local directories TeslaThales (formally Thompson)
Amperex
Burle
Eimac
GEC
HP
Machlett Laboratories
Penta
Philips
Raytheon
RCA
Siemens
STC
Svetlana

Manufacturer's web sites.
Burle
Eimac
Penta
Thales (formally Thompson)