GU43A
TETRODE
The GU43A tetrode is designed for continuous operation at frequencies up to 100 MHz in RF power amplifier circuits, and as linear power amplifiers in RF equipment
GENERAL
Cathode: indirectly heated, oxidecoated
Envelope: glasstometal
Cooling: liquid
Height: at most 125 mm
Diameter: at most 85 mm
Mass: at most 0.7 kg
ĘP  cathode and heater; P  heater; C2  grid 2; C1  grid 1; A  anode
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, at most 
80100 
output, at most  1018 
transfer, at most  0.1 
Cathode heating time, s, at most  180 
Output power, kW, min.:  
at anode voltage 3 kV, grid 2 voltage 350 V, anode current 0.9 A  1.6 
over 1,000 h of service  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 Characteristics:
U_{f} = 12.6V;U_{g2} = 350V;
P_{a max}
Averaged Anode Grid Characteristic Curves:
U_{f} = 12.6V; U_{g2} = 350V
Averaged Grid 2Anode Characteristic Curves:
U_{f} = 12.6V; U_{g2} = 350V