GU39B1
TETRODE
The GU39B1 tetrode is used as a power
amplifier in stationary shortwave transmit
ters
GENERAL
Cathode: directly heated, carbonized thoriated tungsten.
Envelope: glasstometal.
Cooling: forced air.
Height: at most 293 mm.
Diameter: at most 128 mm.
Mass: at most 8 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  63 
Filament current, A  85105 
Mutual conductance (at anode voltage 3 kV, grid 2 voltage 1 kV, anode currents 1.5 and 2 A), mA/V  2028 
Gain coefficient (grid 1 grid 2) (at anode voltage 3 kV, grid 2 voltages 1 and 1.2 kV, anode current 1.5 A)  69 
Anode current (at anode voltage 3 kV, grid 1 voltage 100 V, grid 2 voltage 1 kV), A, at most  1 
Negative bias voltage (at anode voltage 8.5 kV, grid 2 voltage 1.2 kV, anode current 0.5 A), V  140180 
Interelectrode capacitance, pF:  
input, at most  80 
output, at most  29 
transfer,at most  0.7 
Output power (at anode voltage 10 kV, operating frequency 30 MHz), kW, at least  13 
Limit Operating Values  
Filament voltage, V  66.6 
Anode voltage (DC), kV  10 
Negative grid 1 voltage, V  800 
Grid 2 voltage (DC), kV  2 
Filament starting current, A  150 
Dissipation, W:  
anode  8x10³ 
grid 2  450 
grid 1  200 
Operating frequency at output power at least 13kW, MHz  30 
Cutoff frequency, MHz  100 
Anode temperature, °C  200 
Temperature at envelope, stem and seals, °C  150 
Averaged Anode Characteristic Curves:
U_{f} = 6.3V; U_{g2} = 1kV
Averaged Anode Characteristic Curves:
U_{f} = 6.3V; U_{g2} = 1.5kV
Averaged AnodeGrid Characteristic Curves:
U_{f} = 6.3V; U_{g2} = 1kV
Averaged AnodeGrid Characteristic Curves:
U_{f} = 6.3V; U_{g2} = 1.5kV
Averaged Characteristic Curves:
U_{f} = 6.3V; U_{g2} = 1kV;
_____ grid 1anode;
_ _ _ grid 2anode
Averaged Grid 1 Characteristic Curves:
U_{f} = 6.3V; U_{g2} = 1kV
Averaged Characteristic Curves:
U_{f}=6.3V;U_{g2}=1.5kV;
_____ grid 1anode;
_ _ _ grid 2anode
Averaged Grid 1 Characteristic Curves:
U_{f} = 6.3V; U_{g2} = 1.5kV
Averaged Grid 2 Characteristic Curves:
U_{f} = 6.3V; U_{g2} = 1kV
Averaged Grid 2 Characteristic Curves:
U_{f} = 6.3V; U_{g2} = 1.5kV