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.

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

Averaged Anode Characteristic Curves:
U_f = 27V; U_g2 = 300V

Averaged Grid and Anode-Grid Characteristic Curves:
U_f = 27V; U_g2 = 300V;
_____ anode;
_ _ _ grid 2;
_ . _ grid 1

Averaged Grid-Anode Characteristic Curves:
U_f = 27V; U_g2 = 300V;
————— (I_g2);
- - - (I_g1)

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