Preamps
Heater
Uf (DC) .... 5 volts
If (DC) ............... 1.2 A
Maximum Ratings
Voltage source 480V
Pa............40W
I know
With cathode bias......... 100 mA
Fixed bias ............... 70 mA
Direct interelectrode capacitance
Input ...............9 PF
Output ..................4.3 PF
Grid to Plate..................15 PF

Static parameters
Voltage source....................300 V
-Ug...............60V
Current value....60 mA

Transconductance voltage...............5.5 mA/V
Relative humidity...............0.7K
You.... 3.85
Pout....................6.6W