Input power    Output power  Plate voltage   Plate current   Grid current
   1  W           200 W        1800 V          0.32 A         0 mA
   1.5W           370 W        1750 V          0.38 A        -1 mA
   2  W           470 W        1750 V          0.44 A        -2 mA
   2.5W           480 W        1700 V          0.44 A        -1 mA
   3  W           500 W        1700 V          0.44 A       0.5 mA
   4  W           550 W        1700 V          0.44 A         2 mA