GI50A
TRIODE
The GI50A triode is used as a wideband signal amplifier with a peak output power of up to 2 MW at frequencies up to 170 MHz.
GENERAL
Cathode: directly heated, carbonized thoriated tungsten.
Envelope: metalceramic with outer copper anode and ring leads of cathode and grid.
Cooling: forced (water for anode, air for stem and bulb).
Height: at most 420 mm.
Diameter: at most 210 mm.
Mass: at most 18 kg.
OPERATING ENVIRONMENTAL CONDITIONS  
Vibration loads:  
frequencies, Hz  580 
acceleration, m/s²  24 
Multiple impacts with acceleration, m/s²  118 
Ambient temperature, °C  60 to+70 
Relative humidity at +40 °C, %  98 
BASIC DATA Electrical Parameters 

Filament voltage (AC or DC), V  13 
Filament current, A  480560 
Negative cutoff voltage, absolute value (at anode voltage 10 kV, anode current 0.1 A), V, at most  450 
Peak anode current (at anode voltage 3 kV, peak grid voltage 2 kV, negative grid voltage 250 V), A, at least  350 
Peak grid current (at anode voltage 3 kV, peak grid voltage 2 kV, negative grid voltage 250 V), A, at most  105 
Mutual conductance (at anode voltage 4 kV, anode currents 2.5 and 4.5 A), mA/V  6585 
Gain coefficient (at anode voltages 3 and 4 kV, anode current 4.5 A)  3044 
Cathode heating time, s, at most  15 
Peak oscillatory power (at anode voltage 26 kV, pulse duration 1,000 µs, pulse 1/duty factor at least 40, frequency at most 170 MHz), MW, at least  2 
Interelectrode capacitance, pF: input 
160185 
output, at most  3.5 
transfer  4252 
Limit Operating Values  
Filament voltage (AC or DC), V:  
maximum  13.7 
minimum  12.3 
Filament starting current, A  800 
Peak anode voltage, kV  32 
Dissipation, kW:  
anode  40 
grid  1 
Minimum 1/duty factor  40 
Maximum pulse duration, µs  1,000 
Operating frequency, MHz  170 
Temperature at metaltoceramic seals, °C  150 
Characteristic Curves Showing Emission Current versus Anode and Grid Voltages
Averaged Characteristic Curves:
U_{f} = 15V;
_____ anodegrid;
_ _ _ grid
Averaged Characteristic Curves:
U_{f} = 13V;
_____ anode;
_ _ _ gridanode