GU45A
TRIODE
The GU45A triode is used as a power amplifier, modulator or oscillator in RF equipment
GENERAL
Cathode: directly heated, carbonized thoriated tungsten.
Envelope: glasstometal
Cooling: forced (water for anode, air for stem and envelope)
Height: at most 294 mm.
Diameter: at most 146 mm.
Mass: at most 4 kg
OPERATING ENVIRONMENTAL CONDITIONS  
Ambient temperature, °C  10 to +55 
Relative humidity at up to 25 °C, %  98 
BASIC DATA Electrical Parameters 

Filament voltage, V  7.5 
Filament current, A  140160 
Mutual conductance (at anode voltage 4 kV, anode currents 2 and 4 A), mA/V  19.528.5 
Gain coefficient (at anode voltage 8 kV, anode current 2 A)  1925 
Interelectrode capacitance, pF:  
input, at most  41 
output, at most  3 
transfer, at most  27 
Negative cutoff voltage (at anode voltage 10 kV, anode current 0.02 A), V  460690 
Limit Operating Values  
Filament voltage, V  7.8 
Anode voltage (DC), kV:  
at frequencies up to 25 MHz  10.5 
at frequencies 2550 MHz  8.4 
Filament starting current, A  225 
Anode dissipation, kW  20 
Operating frequency, MHz  50 
Temperature at envelope and seals, °C  150 