The WE1078Y is a water cooled triode that is the Bell Labs developmental tube that became the WE 340A. Data for the 340A with its mu of 40 is given below. This tube was date coded in 1938 whereas the 340A was first produced in 1939.

Length = 21.00" Diameter = 4.25" (less grid pin)
Max voltage = 18000
Max current = 1.1 amps
Fil voltage = 20
Fil current = 72 amps         GOTO INDEX