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)