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.
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 |
Averaged Anode Characteristic Curves:
Uf = 26V; Ug2 = 300V
Averaged Anode Characteristic Curves:
Uf = 26V; Ug2 = 400V
Averaged Anode-Grid and Grid Characteristic Curves:
Uf = 26V; Ug2 = 300V;
————— (Ia);
- - - (Ig2);
— • — (Ig3)
Averaged Anode-Grid and Grid Characteristic Curves:
Uf = 26V; Ua = 400V;
- - - (Ig2);
— • — (Ig3)
Averaged Grid-Anode Characteristic Curves:
Uf = 26V; Ug2 = 300V;
_____ (Ig2);
- - - (Ig1)
Averaged Grid-Anode Characteristic Curves:
Uf = 26V; Ug2 = 400V;
_____ (Ig2);
- - - (Ig1)
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