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GU-74B

TETRODE

The GU-74B tetrode is used in wideband nontunable amplifiers and for single-sideband power amplification in stationary and mobile RF equipment.

GENERAL
Cathode: indirectly heated, oxide-coated.
Envelope: metal ceramic.
Cooling: forced air.
Height: at most 90 mm.
Diameter: at most 71 mm.
Mass: at most 550 g.

gu-74b(1)00081.jpg
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 1-200
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 3.3-3.9
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 26-38
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 18-32
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 46-56
output 9-13
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 AB1 (at anode voltage 2,000 V, grid 2 voltage 300 V, grid 1 voltage -60 V, grid 2 current at most 50 mA, frequency 0.1-1.0 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:
third-order components, at most -28
fifth-order 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 AB1 over 1,000 h of service, W, at least 440

Limit Operating Values
Heater voltage (AC or DC), V 11.9-13.3
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

gu-74b(3)00101.jpg
Averaged Anode Characteristic Curves:
Uf = 12.6V; Ug2 = 150V;
- Pa max

gu-74b(3)00102.jpg
Averaged Anode Characteristic Curves:
Uf = 12.6V; Ug2 = 250V;
- Pa max

gu-74b(3)00103.jpg
Averaged Anode Characteristic Curves:
Uf = 12.6V; Ug2 = 250V;
- Pa max

gu-74b(3)00104.jpg
Averaged Anode Characteristic Curves:
Uf = 12.6V; Ug2 = 300V;
- Pa max

gu-74b(3)00105.jpg
Averaged Characteristic Curves:
Uf = 12.6V; Ug2 = 250V;
_____ grid 2-anode;
_ _ _ grid 1-anode

gu-74b(3)00106.jpg
Averaged Characteristic Curves:
Uf = 12.6V; Ug2 = 300V;
_____ grid 2-anode;
_ _ _ grid 1-anode

gu-74b(4)001000011.jpg
Averaged Characteristic Curves:
Uf = 12.6V; Ug2 = 250V;
_____ anode-grid;
_ _ _ grid

gu-74b(4)001000012.jpg
Averaged Characteristic Curves:
Uf = 12.6V; Ug2 = 300V;
_____ anode-grid;
_ _ _ grid