GU34B1
TETRODE
The GU34B1 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 126 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; Icontact surfaces
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  3.64.4 
Mutuai conductance (at anode voltage 650 V, grid 2 voltage 400 V, anode current 1 A), mA/V  6080 
Cutoff voltage (at anode voltage 1.8 kV, grid 2 voltage 400 V, anode current 5 mA), V, at most  80 
Interelectrode capacitance, pF:  
input, at most  7893 
output, at most  914 
transfer, at most  0.1 
Warm up time, s, at most  150 
Output power, W, at least  400 
Output power over 2,000 h of service, W, at least  320 
Limit Operating Values  
Anode voltage, V  2.5103 
Peak anode voltage, V  4.7.103 
Grid 2 voltage, V  500 
Negative grid 1 voltage, V  100 
Cathode current (DC component), mA  700 
Peak cathode current, mA  2.5103 
Dissipation, W:  
anode  650 
grid 2  15 
grid 1  1.5 
Frequency, MHz  250 
Cathode heating time, s  150 
Temperature at anode, stem and seals, °C  150 
Averaged Anode Characteristic Curves:
U_{f} = 12.6V; U_{g2} = 300V;
__ . __ P_{a max}
Averaged Anode Characteristic Curves:
U_{f} = 12.6V; U_{g2} = 400V;
—— • —— P_{a max}
Averaged Characteristic Curves:
U_{f} = 12.6V; U_{a} = 1.000V;
_____ anodegrid;
_ _ _ grid 2;
_ . _ grid 1
Averaged GridAnode Characteristic Curves:
U_{f} = 12.6V; U_{g2} = 300V;
_____ grid 1;
_ _ _ grid 2
Averaged GridAnode Characteristic Curves:
U_{f} = 12.6V; U_{g2} = 400V;
_____ grid 2;
_ _ _ grid 1