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Filament specifications:
Voltage 2.5 V
Current 1.3 A
Amplification Factor 3.5
DC Plate Voltage 300 V
DC Plate Current 50 mA
Dissipation 15 W
DC Plate Voltage 250 V
DC Plate Current 34 mA
Grid Voltage -50 V
Plate Resistance 1.6 kohm
Transconductance 2.2 mA/V