The 38111A is a 100 watt triode with a mu of 12 and a maximum frequency of 15 MHz. It is a 211 with lower capacities for use as an oscillator. The first example is a very early De Forest (1933 or before) and the second is a United from WWII. The De Forest is marked 511CH internally.

Length = 7.87" Diameter = 2.31"
Max voltage = 1250
Max current = 150 ma
Fil voltage = 10
Fil current = 3.25 amps         GOTO INDEX