The 12QR205 or DCG 12/30 is a triode mercury vapor thyratron. This example made by Tungram. The corona cap is phenolic.
Length = 14.75" Diameter = 2.50"
Max voltage = 27000 piv
Max current = 2.5 amps
Fil voltage = 5
Fil current = 13.5 amps GOTO INDEX