TETRODE
The GU74B tetrode is used in wideband nontunable amplifiers and for singlesideband power amplification in stationary and mobile RF equipment.
GENERAL
Cathode: indirectly heated, oxidecoated.
Envelope: metal ceramic.
Cooling: forced air.
Height: at most 90 mm.
Diameter: at most 71 mm.
Mass: at most 550 g.
1  grid 1; 2, 4, 6
 cathode; 3, 7  heater; 5, C2  grid 2; A  anode;
I  contact surfaces
OPERATING ENVIRONMENTAL CONDITIONS  
Vibration loads:  
frequencies, Hz  1200 
acceleration, m/s²  49 
Multiple impacts with acceleration, m/s²  392 
Ambient temperature, °C  10 to +55 
Relative humidity at up to +25 °C, %  98 
BASIC DATA
Electrical Parameters 

Heater voltage (AC or DC), V  12.6 
Heater current, A  3.33.9 
Mutual conductance (at anode voltage 1,000 V, grid 2 voltage 300 V, grid 1 voltage change ±2.5 V, anode current 600 mA), mA/V  2638 
Anode current (at anode voltage 250 V, grid 2 voltage 300 V), mA, at least  1,400 
Negative bias voltage (at anode voltage 1,000 V, grid 2 voltage 300 V, anode current 600 mA), absolute value, V  1832 
Negative cutoff voltage (at anode voltage 2,500 V, grid 2 voltage 300 V, anode current 15 mA), absolute value, V, at most  90 
Interelectrode capacitance, pF:  
input  4656 
output  913 
transfer,at most  0.09 
Cathode heating time (at heater voltage 12.6 V, anode voltage 1,000 V, grid 2 voltage 300 V), s, at most  150 
Output power under conditions of class AB_{1} (at anode voltage 2,000 V, grid 2 voltage 300 V, grid 1 voltage 60 V, grid 2 current at most 50 mA, frequency 0.11.0 MHz), W, least  550 
Relative level of combination components (at anode voltage 2,000 V, grid 2 voltage 300 V, grid 1 voltage 70 V, grid 2 current at most 50mA), dB:  
thirdorder components, at most  28 
fifthorder components, at most  28 
Output power under conditions of class ¶ (at anode voltage 1,500 V, grid 2 voltage 275 V, grid 1 voltage 45 V, grid 2 current at most 60 mA), W, at least  500 
Output power under conditions of class AB_{1} over 1,000 h of service, W, at least  440 
Limit Operating Values  
Heater voltage (AC or DC), V  11.913.3 
Anode voltage, V:  
DC  2,000 
peak value  4,000 
Grid 2 voltage (DC), V  300 
Negative grid 1 voltage, absolute value, V  150 
Cathode current mA:  
DC component  750 
peak value  2,500 
Dissipation, W;  
anode  600 
grid 1  2 
grid 2  15 
Operating frequency, MHz  250 
Averaged Anode Characteristic Curves:
U_{f}
= 12.6V; U_{g2} = 150V;
 _ _ P_{a max}
Averaged Anode Characteristic Curves:
U_{f}
= 12.6V; U_{g2} = 250V;
 _ _ P_{a max}
Averaged Anode Characteristic Curves:
U_{f}
= 12.6V; U_{g2} = 250V;
 _ _ P_{a max}
Averaged Anode Characteristic Curves:
U_{f}
= 12.6V; U_{g2} = 300V;
 _ _ P_{a max}
Averaged Characteristic Curves:
U_{f}
= 12.6V; U_{g2} = 250V;
_____ grid 2anode;
_ _ _ grid 1anode
Averaged Characteristic Curves:
U_{f}
= 12.6V; U_{g2} = 300V;
_____ grid 2anode;
_ _ _ grid 1anode
Averaged Characteristic Curves:
U_{f}
= 12.6V; U_{g2} = 250V;
_____ anodegrid;
_ _ _ grid
Averaged Characteristic Curves:
U_{f}
= 12.6V; U_{g2} = 300V;
_____ anodegrid;
_ _ _ grid
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