GU34B
TETRODE
The GU34B tetrode is used for wideband power amplification at frequencies up to 250 MHz in RF equipment.
GENERAL
Cathode: indirectly heated, oxidecoated.
Envelope: glasstometal.
Cooling: forced air.
Height: at most 125 mm.
Diameter: at most 94 mm.
Mass: at most 1 kg.
KP  cathode and heater; P  heater; C1  grid 1; C2  grid 2: A  anode
OPERATING ENVIRONMENTAL CONDITIONS  
Ambient temperature, °C  10 to + 55 
Relative humidity at up to +25°C, %  98 
BASIC DATA Electrical Parameters 

Heater voltage, V  12.6 
Heater current, A  3.34 
Mutual conductance (at anode voltage 1 kV, grid 2 voltage 500 V, anode current 500 mA), mA/V  2234 
Gain coefficient (grid 1 grid 2, at anode voltage 1 kV, grid 2 voltage 400500 V, anode current 500 mA)  19 
Cutoff voltage (at anode voltage 1 kV, grid 2 voltage 500 V, anode current 5 mA), V, at most  80 
Interelectrode capacitance, pF:  
input, at most  6373 
output, at most  711 
transfer, at most  0.12 
Warm up time, min, at most  2.5 
Output power, W, at least  400 
Output power over 1.500 h of service, W, at least  320 
Limit Operating Values  
Heater voltage, V  13.9 
Anode voltage, kV  4103 
Grid 2 voltage, V  600 
Cathode current (DC component), mA  540 
Dissipation, W:  
anode  500 
grid 2  20 
grid 1  5 
Frequency, MHz  250 
Temperature at anode, stem and seals, °C  150 
Averaged Anode Characteristic Curves:
U_{f} = 12.6V; U_{g2} = 400V
Averaged Anode Characteristic Curves:
U_{f} = 12.6V; U_{g2} = 500V
Averaged Grid 2Anode Characteristic Curves:
U_{f}= 12.6V; U_{g2} = 400V
Averaged Grid 2Anode Characteristic Curves:
U_{f} = 12.6V; U_{g2} = 500V