TETRODE

GU-73B

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

8min I

∅ 100±1 ∅ 18±1

GENERAL

40±1

A

27 4.55-5.15 1.7 250 18-40 120 1.5 -130 65 3-7

-30 210

2.5

Limit Operating Values Heater voltage, V Anode voltage (DC), kV Grid 2 voltage (DC), V Negative grid 1 voltage, V Anode dissipation, kW: single-sideband signal amplification TV signal amplification Grid 2 dissipation, W Grid 1 dissipation, W Cathode current (DC component), A Anode current (instantaneous value), A Operating frequency, MHz Temperature at anode, stem and seals, °C

C2

24.7-27.3 3 325 150 2.5 3.5 35 5 2.2 7 250 200

2

9±1

∅89±0.5

2 12±0.3

2

2

∅4±0.3

C1 K

BASIC DATA Electrical Parameters Heater voltage (AC or DC), V Heater current, A Anode voltage, kV Grid 2 voltage, V Negative grid 1 bias voltage, V Negative cutoff voltage, V, at most Anode current, A Grid 2 current, mA Mutual conductance, mA/V, at least Gain coefficient (grid 1 grid 2) 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 Warm up time, s, at most Oscillatory power under conditions of class AB1 (at anode voltage 3 kV, grid 2 voltage 300 V, anode current 750 mA, grid 2 current at most 110 mA), kW, at least Interelectrode capacitance, pF: input 190 output 27 transfer 0.2

31±1 15±1.5

5-80 25 118 88 -60 95-98

18±2

Vibration loads: frequencies, Hz acceleration, m/s2 Multiple impacts with acceleration, m/s2 Linear loads with acceleration, m/s2 Lowest permissible ambient temperature, °C Relative humidity at up to +40 °C, %

98±3

OPERATING ENVIRONMENTAL CONDITIONS

150max

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

∅58±0.6 ∅ 72±0.5 ∅82±0.5

H H

CONNECTION OF ELECTRODES WITH LEADS

A C2

C1 K K - cathode; H - heater; H

H

C1 - grid 1; C2 - grid 2; A - anode

I 6min

Ia,A 10

20

3000 1700 500

Ia, Ig2,Ig1,A

9 8

Ug1V 10

6 7 6 U a, V

0 5 4

4

-10

3

-20 2

2 -30 -40

1

V 500 500 U a=

-50 Ua, kV

0 1

2

3

-100

-50

Ig2,Ig1,A 1.0 Ug1=20V 10 0 -10

0.5

-20

Ug1=20V

-30 -40

10

0 -0.1

2.0

1.0

Ua,kV

0

Ug1, V

Averaged Grid and Anode-Grid Characteristic Curves: U1 = 27V; Ug2 = 300V _________ anode; _ _ _ _ _ _ grid 2; __ . __ . __ grid 1

Averaged Anode Characteristic Curves: U1 = 27V; Ug2 = 300V;

Averaged Grid-Anode Characteristic Curves: U1 = 27V; Ug2 = 300V _________ (Ig2); _ _ _ _ _ _ (Ig1)