Gema TS6

Military type  
Use High frequency triode ?
Manufacturer Gema
Vf 2 V
If 31A
Va 700 V
Ia 650 mA
Height 130 mm
Diameter 95 mm
Weight 190 grams

The filament current is printed on the glass bulb.
Used in German WW2 "Seetakt"-system in push-pull at 368 MHz