gu-43b

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

GU-43b

GU-43b
C₁ - grid 1; KP - cathode & heater; P - heater; C₂ - grid 2; A - anode

GU-43b

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 (V_a = 1KV, V_g2 = 300V, I_a = 600mA, change in V_g1 = 2.5V), mA/V: 45

Anode current (I_a) with V_a = 3KV, V_g1 = -50V, V_g2 = 350V, A: ~0.9

Negative bias (V_g1) with V_a = 1KV, V_g2 = 350V, I_a > 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, V_a = 3KV, I_a ~0.9A, V_g1 = -50V, V_g2 = 350V, I_g1 < 0mA, I_g2 < 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 (V_a), KV: 3.3

"Maximum" Control Grid voltage (V_g1), V -200

Maximum Screen Grid voltage (V_g2), V 500

CW cathode current (I_c), A: 1

Peak cathode current (I_c), 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

gu-43b
Averaged Anode Characteristic Cooling Curves:
Anode T °C plotted against Airflow, m³/sec vs P_a

gu-43b
Averaged Anode Characteristic Curves:
^___ . ^___ . ^___ P_a Dissipation: U_f = 12.6V; U_g2 = 350V;

gu-43b
Averaged Anode Characteristic Curves:
U_f = 12.6V; U_g2 = 350V

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

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 (V_a = 1KV, V_g2 = 300V, I_a = 600mA, change in V_g1 = 2.5V), mA/V:	45
Anode current (I_a) with V_a = 3KV, V_g1 = -50V, V_g2 = 350V, A:	~0.9
Negative bias (V_g1) with V_a = 1KV, V_g2 = 350V, I_a > 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, V_a = 3KV, I_a ~0.9A, V_g1 = -50V, V_g2 = 350V, I_g1 < 0mA, I_g2 < 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 (V_a), KV:	3.3
"Maximum" Control Grid voltage (V_g1), V	-200
Maximum Screen Grid voltage (V_g2), V	500
CW cathode current (I_c), A:	1
Peak cathode current (I_c), 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