The 152T is a 150 watt triode with a mu of 10 made with two 75T triodes placed in parallel. They are usable up to 40 MHz at full rating. The first example is very early and has a stepped envelope and no "bulge" where the glass was sealed. It also has an unusual brown base. The second example was made in August, 1944 and an Eimac patent, 2,355,717, dated Febuary 1941 illustrates the same flattened top. An interesting advantage of this tube as described in the patent was to only use one side of the tube until it failed and then turn it around and use the other side. The unused side could also be employed as a neutralizing capacitor. Early in WWII, the 152Ts were used as RADAR pulse modulators. The 152T was replaced by the 152TH and the 152TL.
Length = 7.63" Diameter = 2.57"
Max voltage = 3000
Max current = 450 ma
Fil voltage = 5 or 10
Fil current = 12.5 or 6.25 amps