GU29
TETRODE
The GU29 beampower double tetrode is used as an oscillator and a power amplifier operating in the metric wavelength range in RF equipment.
GENERAL
Cathode: indirectly heated, oxidecoated.
Envelope: glass, nobase.
Cooling: forced air.
Height: at most 110 mm.
Diameter: at most 61 mm.
Mass: at most 125 g.
1, 7  heater; 2  grid 1 of second tetrode; 3  grid 2; 4  cathode and beamforming plates; 5  heater (centre tap): 6  grid 1 of first tetrode; A1  anode of first tetrode  top lead; A2  anode of second tetrodetop lead
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  11.3 
Anode current (at anode voltage 250 V, grid 1 voltage 11 V of first tetrode, grid 1 voltage 100 V of second tetrode, grid 2 voltage 175 V), mA  3885 
Interelectrode capacitance, pF:  
input, at most  1317 
output, at most  59 
transfer, at most  0.1 
Output power, W, min:  
at anode voltage 400 V, grid 2 voltage at most 225 V, operating frequency 100200 MHz  42 
over 500 h of service  34 
Limit Operating Values  
Heater voltage, V:  
with heaters connected in parallel  5.76.9 
with heaters connected in series  11.313.8 
Anode voltage, V  750 
Grid 2 voltage, V  225 
Dissipation, W:  
anodes  40 
grid 2  7 
grid 1  1 
Envelope temperature, °C  175 
Characteristic Curve Showing Anode Dissipation versus Ambient Temperature (at bulb temperature T_{b} 175 °C)