GU33 B
TETRODE
The GUÇÇB tetrode is designed to operate for wideband power amplification at frequencies up to 500 MHz in RF equipment.
GENERAL
Cathode: indirectly heated, oxidecoated.
Envelope: glasstometal.
Cooling: forced air.
Height: at most 85 mm.
Diameter: at most 50 mm.
Mass: at most 220 g.
KP  cathode and heater; P  heater; C2  grid 2; C1  grid 1; A  anode
OPERATING ENVIRONMENTAL CONDITIONS  
Vibration loads:  
frequencies, Hz  1660 
acceleration, m/s²  25 
Multiple impacts with acceleration, m/s²  118 
Ambient temperature, °C  10 to +55 
Relative humidity at up to 25 °C, %  98 
Negative cutoff voltage (at anode voltage 1,000 V, grid 2 voltage 300 V, anode current 5 mA), V (absolute value), at most
BASIC DATA Electrical Parameters 

Heater voltage, V  6.3 
Heater current, A  4.75.6 
Mutual conductance (at anode voltage 400 V, grid 2 voltage 300 V, anode current 375 mA), mA/V  2032 
Gain coefficient (at anode voltage 400 V, grid 2 voltage 300 V, anode current 375 mA)  13 
Negative bias voltage (at anode voltage 400 V, grid 2 voltage 300 V, anode current 375 mA), V (absolute value), at most  212 
60  
Interelectrode capacitance, pF:  
input, at most  3646 
output, at most  710 
transfer, at most  0.1 
Output power, W, min.:  
at 5060 MHz, anode voltage 1 kV, grid 2 voltage 250 V, grid 1 voltage 40 V, drive voltage 52 V peak value, grid 2 current almost 40 mA, anode dissipation at most 150 W, grid 1 dissipation at most 2 W)  120 
over 1.500 h of service  105 
Warm up time (at anode voltage 400 V and grid 2 voltage 300 V) mm at most  2.5 
Limit Operating Values  
Heater voltage, V  5.76.9 
Anode voltage (DC), V  1500 
Grid 2 voltage, V  400 
Cathode current (DC component), mA  340 
Cathode current under conditions of class Â, mA (peak value)  1000 
Dissipation, W:  
anode  150 
grid 1  2 
grid 2  10 
Operating freguency, MHz  500 
Temperature at anode, stem and glasstometal seals, °C  150 
Averaged Anode Characteristic Curves
U_{f} = 6.3V; U_{g2} = 300V
Averaged GridAnode Characteristic Curves
U_{f} = 6.3V; U_{g2} = 300V