GM3B
TRIODE
The GM3B triode is used in lowfrequency no distortion cathodecoupled amplifier circuits in RF equipment.
GENERAL
Cathode: directly heated, carbonized thoriated tungsten.
Envelope: glasstometal.
Cooling: forced air.
Height: at most 240 mm.
Diameter: at most 120 mm.
Mass: at most 4 kg.
OPERATING ENVIRONMENTAL CONDITIONS  
Ambient temperature, °C  10 to +55 
Relative humidity at up to +25 °C, %  80 
BASIC DATA Electrical Parameters 

Filament voltage, V  6.3 
Filament current, A  140160 
Mutual conductance, mA/V  1727 
Gain coefficient  711 
Anode current at zero grid voltage, A:  
at anode voltage 1.5 kV  2.43.6 
at peak anode voltage 3k V  610 
Cutoff voltage (at anode voltage 4.5 kV, anode current 0.5 A), V, at most  600 
Interelectrode capacitance, pF:  
input, at most  36 
output, at most  6 
transfer, at most  36 
Limit Operating Values 

Filament voltage, V  66.6 
Anode voltage, kV  6 
Dissipation, W:  
anode  7.5x10³ 
grid  300 
Temperature at envelope, stem and seals, °C  150 
Averaged Anode Characteristic Curves:
U_{f} = 6.3V;
— • — P_{a max}
Averaged Characteristic Curves:
U_{f} = 6.3V;
_____ anodegrid;
_ . _ grid