GI26A
TRIODE
The GI26A triode is used as an power amplifier for pulsed operation with anode keying.
GENERAL
Cathode: directly heated, carbonized thoriated tungsten.
Envelope: glasstometal with grid ring.
Cooling: forced (water for anode, grid, filament leads, air for stem and bulb).
Height: at most 530 mm.
Diameter: at most 182 mm.
Mass: at most 13 kg.
OPERATING ENVIRONMENTAL CONDITIONS  
Vibration loads:  
frequencies, Hz  160 
acceleration, m/s²  9.8 
Ambient temperature, °C  10 to +55 
Relative humidity at +40 °C, %  98 
BASIC DATA Electrical Parameters 

Filament voltage (AC or DC), V  12.6 
Filament current, A  530590 
Resistance of heated cathode, Om  0.002 
Mutual conductance (at anode currents 6 and 10 A), anode voltage 2 kV), mA/V  85100 
Gain coefficient (at anode voltages 2 and 3 kV, anode current 6 A)  2838 
Interelectrode capacitance, pF:  
input, at most  185 
output, at most  3 
transfer, at most  75 
Limit Operating Values  
Maximum filament voltage (AC or DC), V  13 
Minimum filament voltage (AC or DC), V:  
in pulsed operation  12 
in continuouswave operation  11 
Filament starting current, A  900 
Anode voltage, kV:  
peak value  30 
DC  12 
Dissipation, kW:  
anode  60 
grid  3 
Operating frequency, MHz  25 
Maximum pulse duration (in operation with single pulses of up to 10 ms duration), µs  1,000 
Temperature at bulb, stem, glasstometal seals, °C  150 
Averaged Characteristic Curves:
U_{f} = 12.6V;
_____ anode;
_ _ _ gridanode;
— • — P_{a max}
Averaged Characteristic Curves:
U_{f} = 12.6V;
_____ anodegrid;
_ _ _ grid curves