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GU-43b
Tetrode
The GU-43B tetrode is used for wideband power amplification at
frequencies up to 100 MHz in RF equipment. This tube is generally
considered analogous to the 4CX1000.
GENERAL
Cathode: indirectly heated, oxide-coated.
Envelope: metal-to-glass.
Cooling: 100 m3/hour forced air.
Height, mm, at most: 125
Diameter, mm, at most: 101
Mass, Kg, at most: 1.5
C1 - grid 1; KP - cathode &
heater; P - heater; C2 - grid 2; A
- anode
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ENVIRONMENTAL OPERATING CONDITIONS
Vibration loads:
frequency, Hz 10-200
acceleration, m/s² 58
Multiple impacts with acceleration, m/s²
342
Ambient Conditions:
Temperature, °C -60 to +150
Relative humidity at up to +40 °C, % 98
NOMINAL ELECTRICAL PARAMETERS
Heater voltage, V 12.6
Heater current, A 6.6
Mutual conductance (Va = 1KV, Vg2 = 300V, Ia = 600mA, change in Vg1 = 2.5V), mA/V:
45
Anode current (Ia) with Va = 3KV, Vg1 = -50V, Vg2 = 350V, A:
~0.9
Negative bias (Vg1) with Va = 1KV, Vg2 = 350V, Ia > 800mA, V:
20-30
input capacitance, pF 90
output capacitance, at most, pF 14
transfer capacitance, pF <0.1
Warm up time, s: <180
AB1 Output, Va = 3KV, Ia ~0.9A, Vg1 = -50V, Vg2 = 350V, Ig1 < 0mA, Ig2 < 80mA, KW:
>1.6
Designed Tube Life (hours) >1000
ELECTRICAL PARAMETER LIMITS
Heater voltage, V 12.6 +/- ?
Heater current, A
6-7.2
input capacitance, pF 80-100
output capacitance, pF 10-18
Maximum CW Anode voltage (Va), KV:
3.3
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"Maximum" Control Grid voltage (Vg1), V
-200
Maximum Screen Grid voltage (Vg2), V
500
CW cathode current (Ic), A:
1
Peak cathode current (Ic), A:
3.2
Anode Dissipation, W: 1000
Screen Grid (G2) Dissipation, W: 28
Control Grid (G1) Dissipation, W: 5
Temperature at envelope (hottest point), °C 150
Frequency, MHz: <100
Averaged Anode Characteristic Cooling Curves:
Anode T °C plotted against Airflow, m3/sec vs P
a
Averaged Anode Characteristic Curves:
___
.
___
.
___
Pa Dissipation: Uf = 12.6V; Ug2 = 350V;
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Averaged Anode Characteristic Curves:
Uf = 12.6V; Ug2 = 350V
Averaged Anode Characteristic Curves:
Uf = 12.6V; Ug2 = 350V
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