GU56
TRIODE
The GU56 triode is used as an oscillator and a power amplifier in stationary industrial RF heating generators and other RF equipment at frequencies up to 45 MHz
GENERAL
Cathode: directly heated, carbonized thoriated tungsten.
Envelope: glasstometal.
Height: at most 280 mm.
Diameter: at most 161 mm.
Mass: at most 4 kg
OPERATING ENVIRONMENTAL CONDITIONS  
Ambient temperature, °C  10 to +35 
Relative humidity at up to +25 °C  80 
BASIC DATA Electrical Parameters 

Filament voltage, V  6.3 
Filament current, A  21.526.5 
Mutual conductance (at anode voltage 300 V, anode currents 1.5 and 1 A), mA/V  610 
Gain coefficient (at anode voltages 300 and 1,000 V and anode current 1 A)  1119 
Anode current (at anode voltage 300 V and grid voltage 250 V), A, at least  1.5 
Cutoff voltage (at anode voltage 3 kV and anode current 0.1 A), V, at most  150 
Interelectrode capacitance, pF:  
input, at most  30 
output, at most  20 
transfer, at most  0.8 
Limit Operating Values  
Filament voltage, V  66.6 
Anode voltage, V  3.5 
Dissipation, W:  
anode  700 
grid  200 
Operating frequency, MHz  45 
Anode temperature, °C  250 
Temperature at glass parts and seals, °C  150 
Averaged Characteristic Curves:
U_{f} = 6.3V;
_____ anodegrid;
_ _ _ grid
Averaged Anode Characteristic Curves:
U_{f} = 6.3V;
— . — P_{a max}
Averaged GridAnode Characteristic Curves:
U_{f} = 6.3V