The 838 or 38138 is a general purpose, 100 watt, triode with a variable mu and with full power to 30 MHz. United produced the 838 with an additional plate support for ruggedization and some of these tubes were marked 838W. Internally this United tube was marked with United's commercial number 938.
Length = 7.87" Diameter = 2.31"
Max voltage = 1250
Max current = 150
Fil voltage = 10
Fil current = 3.25 GOTO INDEX