GU43 B
TETRODE
The GU43B tetrode is used for continuous operation at frequencies up to 100 MHz in separately or selfexcited oscillator circuits and as linear power amplifiers in RF equipment
GENERAL
Cathode: indirectly heated, oxidecoated.
Envelope: glasstometal.
Cooling: forced air.
Height: at most 125 mm.
Diameter: at most 100 mm.
Mass: at most 1.5 kg
OPERATING ENVIRONMENTAL CONDITIONS  
Vibration loads:  
frequencies, Hz  10200 
acceleration, m/s²  59 
frequencies, Hz  200600 
acceleration, m/s²  20 
Multiple impacts with acceleration, m/s²  343 
Linear leads with acceleration, m/s²  147 
Relative humidity at up to +40 °C, %  98 
BASIC DATA Electrical Parameters 

Heater voltage, V  12.6 
Heater current, A  67.2 
Mutual conductance (at anode voltage 1 kV, grid 2 voltage 350 V, anode current 1 A, grid 1 voltage change ±2.5 V), mA/V  4050 
Negative bias voltage (at anode voltage 1 kV, grid 2 voltage 350 V, anode current 1 A),V  2030 
Interelectrode capacitance, pF:  
input  80100 
output  1018 
transfer, at most  0.1 
Cathode heating time, s, at most  180 
Output power (at anode voltage 3 kV, grid 2 voltage 350 V, anode current 0.9 A), kW, at least  1.6 
Output power over 1,000 h of service, kW, at least  1.3 
Limit Operating Values  
Heater voltage, V  11.313.9 
Anode voltage, kV  3.3 
Grid 2 voltage, V  500 
Negative grid 1 voltage, V  200 
Cathode current, A:  
DC component  1 
peak value  3.2 
Dissipation, W:  
anode  1,000 
grid 2  28 
grid 1  5 
Temperature at seals, °C  150 
Averaged Anode Characteristic Curves:
U_{f} = 12.6V; U_{g2} = 350V;
— • — P_{a max}
Averaged AnodeGrid Characteristic Curves:
U_{f} = 12.6V; U_{g2} = 350V
Averaged Grid 2Anode Characteristic Curves:
U_{f} = 12.6V; U_{g2} = 350V