GU22A
TRIODE
The GU22A triode is used as an amplifier or oscillator at frequencies up to 26 MHz in groundedgrid circuits, in stationary RF equipment.
GENERAL
Cathode: directly heated, carbonized thoriated tungsten.
Envelope: glasstometal.
Cooling: forced (water for anode, air for envelope and seals).
Height: at most 355 mm.
Diameter: at most 120 mm.
Mass: at most 5 kg.
OPERATING ENVIRONMENTAL CONDITIONS  
Ambient temperature, °C  550 
Relative humidity at up to +25 °C, %  98 
BASIC DATA Electrical Parameters 

Filament voltage, V  8.3 
Filament current, A  140160 
Mutual conductance (at anode voltage 5 kV, anode currents 2 and 4 A), mA/V  2835 
Gain coefficient (at anode voltages 5 and 8 kV and anode current 2 A)  4158 
Anode current at zero grid voltage (at anode voltage 5 kV), A  1.12.3 
Interelectrode capacitance, pF:  
input, at most  55 
output, at most  1.5 
transfer, at most  45 
Limit Operating Values  
Filament voltage, V  7.88.3 
Anode voltage, kV  10 
Filament starting current, A  225 
Dissipation, W:  
anode  20 
grid  0.6 
Pulse duration, µs  1.000 
Operating frequency, MHz  26 
Temperature at envelope, stem and seals, °C  150 