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GU-73 B

TETRODE

The GU-73B tetrode is used for single-sideband power amplification at frequencies up to 250 MHz.

GENERAL
Cathode: indirectly heated, oxide-coated.
Envelope: metal-to-ceramic.
Cooling: forced air.
Height: at most 150 mm.
Diameter: at most 101 mm.
Mass: at most 150g.

gu-73b(1)00021.jpg
gu-73b(1)00022.jpg
K - cathode; P - heater; C1 - grid 1; C2 - grid 2; A - anode; I - contact surfaces

OPERATING ENVIRONMENTAL CONDITIONS
Vibration loads:
frequencies, Hz 5-80
acceleration, m/s² 25
Multiple impacts with acceleration, m/s² 118
Linear loads with acceleration, m/s² 88
Lowest permissible ambient temperature, °C -60
Relative humidity at up to +40 °C, % 95-98

BASIC DATA
Electrical Parameters
Heater voltage (AC or DC), V 27
Heater current, A 4.55-5.15
Anode voltage, kV 1.7
Grid 2 voltage, V 250
Negative grid 1 bias voltage, V 18-40
Negative cutoff voltage, V, at most 120
Anode current, A 1.5
Grid 2 current, mA -130
Mutual conductance, mA/V, at least 65
Gain coefficient (grid 1 grid 2) 3-7
Voltage level of combination frequencies of third and fifth orders (at anode voltage 3 kV, grid 2 voltage 300 V, anode current 750 mA, grid 2 current at most 110 mA), dB, at most -30
Warm up time, s, at most 210
Oscillatory power under conditions of class AB (at anode voltage 3 kV, grid 2 voltage 300 V, anode current 750 mA, grid 2 current at most 110 mA), kW, at least 2.5
Interelectrode capacitance, pF:
input 190
output 27
transfer 0.2

Limit Operating Values
Heater voltage, V 24.7-27.3
Anode voltage (DC), kV 3
Grid 2 voltage (DC), V 325
Negative grid 1 voltage, V 150
Anode dissipation, kW:
single-sideband signal amplification 2.5
TV signal amplification 3.5
Grid 2 dissipation, W 35
Grid 1 dissipation, W 5
Cathode current (DC component), A 2.2
Anode current (instantaneous value), A 7
Operating frequency, MHz 250
Temperature at anode, stem and seals, °C 200

gu-73b(3)00041.jpg
Averaged Anode Characteristic Curves:
Uf = 27V; Ug2 = 300V

gu-73b(3)00042.jpg
Averaged Grid and Anode-Grid Characteristic Curves:
Uf = 27V; Ug2 = 300V;
_____ anode;
_ _ _ grid 2;
_ . _ grid 1

gu-73b(3)00043.jpg
Averaged Grid-Anode Characteristic Curves:
Uf = 27V; Ug2 = 300V;
————— (Ig2);
- - - (Ig1)