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GU-72

TETRODE

The GU-72 tetrode is used for single-sideband power amplification at frequencies up to 100 MHz in RF transmitters.

GENERAL
Cathode: indirectly heated, oxide-coated.
Envelope: glass-to-metal.
Height: at most 115 mm.
Diameter: at most 67 mm.
Mass: at most 320 mm.

gu-72(1)00091.jpg
1, 4, 8 - cathode and heater; 2, 5, 9 - grid 1; 3, 7, 10 - grid 2; 6 - heater; A - anode; I - contact surface

OPERATING ENVIRONMENTAL CONDITIONS
Vibration loads:
frequencies, Hz 10-200
acceleration, m/s² 39
Multiple impacts with acceleration, m/s² 343
Single impacts with acceleration, m/s² 1,470
Relative humidity at up to +40 °C, % 98

BASIC DATA
Electrical Parameters
Heater voltage, V 26
Heater current, A 0.85-1.05
Mutual conductance (at anode voltage 300 V, grid 2 voltage 250 V, grid 1 voltage change ±2.5 V, anode current 270 mA), mA/V 15-23
Gain coefficient (grid 1-grid 2) (at anode voltage 300 V, grid 2 voltage 200-250 V, anode current 270 mA) 7-12
Negative cutoff voltage, V, at most 220
Interelectrode capacitance, pF:
input, at most 37
output 5-10
transfer, at most 0.1
Output power under conditions of class AB (at anode voltage 800 V, grid 2 voltage 300 V, anode current 68 mA), W, at least 70
Output power over 1,000 h of service, W 26

Limit Operating Values
Heater voltage, V 22-27.2
Anode voltage, kV:
DC 1.3
peak value 1.8
Grid 2 voltage, V 700
Negative grid 1 voltage, V 250
Cathode current, mA:
DC component 250
peak value 750
Dissipation, W:
anode 85
grid 2 15
grid 1 1
Operating frequency, MHz 100
Warm up time, s 2
Envelope temperature, °C 250

gu-72(3)00011.jpg
Averaged Anode Characteristic Curves:
Uf = 26V; Ug2 = 300V

gu-72(3)00012.jpg
Averaged Anode Characteristic Curves:
Uf = 26V; Ug2 = 400V

gu-72(3)00013.jpg
Averaged Anode-Grid and Grid Characteristic Curves:
Uf = 26V; Ug2 = 300V;
(Ia);
- - - (Ig2);
(Ig3)

gu-72(3)00014.jpg
Averaged Anode-Grid and Grid Characteristic Curves:
Uf = 26V; Ua = 400V;
- - - (Ig2);
(Ig3)

gu-72(3)00015.jpg
Averaged Grid-Anode Characteristic Curves:
Uf = 26V; Ug2 = 300V;
_____ (Ig2);
- - - (Ig1)

gu-72(3)00016.jpg
Averaged Grid-Anode Characteristic Curves:
Uf = 26V; Ug2 = 400V;
_____ (Ig2);
- - - (Ig1)