GM3P
TRIODE
The GM3P triode is used in lowfrequency nodistortion cathodecoupled amplifier circuits in stationary RF equipment.
GENERAL
Cathode: directly heated, carbonized thoriated tungsten.
Envelope: glasstometal.
Cooling: forced (evaporation for anode, air for stem and envelope).
Height: at most 250 mm.
Diameter: at most 146 mm.
Mass: at most 8 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 (at anode voltage 2 kV, anode currents 2 and 3 A), mA/V  1727 
Gain coefficient (at anode voltages 2 and 3 kV, anode current 2 A)  711 
Anode current at zero grid voltage, A:  
at anode voltage 1.5 kV  2.43.6 
at peak anode voltage 3 kV  610 
Cutoff voltage (at anode voltage 4.5 kV, anode current 0.5 A), kV, at most  0.6 
Interelectrode capacitance, pF:  
input, at most  40 
output, at most  6 
transfer, at most  40 
Limit Operating Values  
Filament voltage, V  66.6 
Anode voltage (DC), kV  6 
Nagative grid voltage, absolute value, kV  1.5 
Filament starting current, A  225 
Dissipation, W:  
anode  1x10^{4} 
grid  300 
Temperature at 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