GU17
BEAMPOWER TETRODE
The GU17 beampower double tetrode is used for generation or power amplification at frequencies up to 250 MHz in RF equipment.
GENERAL
Cathode: indirectly heated, oxide coated.
Envelope: glass, miniature.
Height: at most 80 mm.
Diameter: at most 22.5 mm.
Mass: at most 25 g.
1  grid 1 of first tetrode; 2  cathode and beamforming plates; 3  grid 1 of second tetrode; 4  heater; 5  heater; 6  anode of first tetrode; 7  grid 2; 8  anode of second tetrode; 9  heater (centre tap)
OPERATING ENVIRONMENTAL CONDITIONS  
Vibration loads:  
frequencies, Hz  20600 
acceleration, m/s²  59 
Multiple impacts with acceleration, m/s²  118 
Single impacts with acceleration, m/s²  490 
Linear loads with acceleration, m/s²  294 
Relative humidity at up to +40°C, %  98 
BASIC DATA Electrical Parameters 

Heater voltage, V  6.3 
Heater current, A  0.720.88 
Mutual conductance (at anode and grid 2 voltages 200 V, end 1 voltage 16 V of first tetrode grid 1 voltage 100 V of 2nd tetrode), mA/V  1.63.3 
Anode current (at anode and grid 2 voltage 200 V, grid 1 voltage 16 V of 1 st tetrode grid 1 voltage 100 V of 2nd tetiode), mA  1030 
Interelectrode capacitance, pF:  
input  5.27.8 
output  2.23.2 
transfer, s, at most  0.1 
Warm up time, s, at most  40 
Output power (at anode voltage 300 V, grid 2 voltage 200V voltage 80 V of grids 1), W, at least  11 
Output power over 400 h of service, W, at least  8.8 
Limit Operating Values  
Heater voltage, V:  
with parallelconnected heater  5.77 
with seriesconnected heater  1114 
Anode voltage, V  400 
Anode voltage at the instant of switching on, V  450 
Voltage between cathode and heater, V  150 to +150 
Cathode current, mA  100 
Dissipation, W:  
anodes  12 
grid 2  3 
grid 1  0.5 
Operating frequency, MHz  250 
Envelope temperature, °C  260 
Maximum Permissible Anode Dissipation P_{a max} versus Ambient Temperature (at bulb temperature T_{b} 260 °C)