GI27AM
TRIODE
The GI27AM triode is used in selfexcited oscillator and power amplifier circuits with pulsed anode modulation in RF equipment.
GENERAL
Cathode: directly heated.
Envelope: metalceramic.
Cooling: forced (water for anode, air for other elements of envelope).
Height: at most 345 mm.
Diameter: at most 171 mm.
Mass: at most 11 kg.
K1, K2  cathode; C  grid; A  anode
OPERATING ENVIRONMENTAL CONDITIONS  
Multiple impacts with acceleration, m/s²  147 
Ambient temperature, °C  155 
Relative humidity at up to +25 °C without moisture condensation, %  80 
BASIC DATA Electrical Parameters 

Filament voltage, V  13 
Filament current, A  470550 
Negative cutoff voltage (at anode voltage 10 kV, anode current 0.1 A), absolute value, V, at most  385 
Peak cathode emission current (at peak anode and grid voltages 3 kV, with interconnected anode and grid), A, at least  500 
Gain coefficient (at anode voltages 4 and 5 kV, anode current 4.5 A)  2646 
Peak power output (at peak anode voltage 40 kV, pulse duration 300µs, at up to 150 MHz), MW, at least  5 
Mutual conductance (at anode voltage 5 kV, anode currents 2.5 and 4.5 A), mA/V  75110 
Interelectrode capacitance, pF:  
input, at most  200 
output, at most  50 
transfer, at most  4 
Limit Operating Values  
Filament voltage, V  13.5 
Peak anode voltage (DC), kV  40 
Negative grid voltage, absolute value, V  4,800 
Anode dissipation, kW  25 
Filament starting current (peak value), A  1,100 
Grid dissipation, W  250 
Pulse duration, µs  500 
Operating frequency, MHz, at most  200 
Temperature at the hottest point of envelope, °C  175 
Averaged Characteristic Curves:
U_{f} = 13V;
_____ anodegrid;
_ _ _ grid