The Y-418 is a vapor phase cooled pentode that appears to be based on the 5CX3000A. The 5CX3000A would operate for full ratings to 150 MHz. The actual dissipation of this tube is unknown. Y-449 and Y-522 are numbers assigned to similar CV tubes based on the 5CX3000A.

Length = 9.75" Diameter = 4.50"
Max voltage = 7000
Max current = 2 amps
Fil voltage = 9
Fil current = 39.5 to 43.5 amps         GOTO INDEX