It's a vacuum tube, treat it like one
Class C (telegraph mode)
Ua= 1000 V (max. 46,1 MHz)
Ua= 800 V Imax. 66,6 MHz)
Ua= 700 V (max. 85,7 MHz)
Ua= 600 V (max. 120 MHz)
Ia = 120 mA
Ug2 = 300 V
Ig2 = 10 mA
Ug1=- 80 V
Ig1=0 mA
Pout=85 W
max cathode current: 230 mA
heater: 12,6 V/0,7A...