STC NavigatoR / Transmitting Tubes / Tube gu-39b-1

GU-39B-1

TETRODE

The GU-39B-1 tetrode is used as a power
amplifier in stationary short-wave transmit-
ters

GENERAL
Cathode: directly heated, carbonized thoriated tungsten.
Envelope: glass-to-metal.
Cooling: forced air.
Height: at most 293 mm.
Diameter: at most 128 mm.
Mass: at most 8 kg

gu-39b-1(1)1.jpg

OPERATING ENVIRONMENTAL CONDITIONS

Ambient temperature, °C 10 to + 55

Relative humidity at up to + 25 °C, % 98

BASIC DATA
Electrical Parameters

Filament voltage, V 63

Filament current, A 85-105

Mutual conductance (at anode voltage 3 kV, grid 2 voltage 1 kV, anode currents 1.5 and 2 A), mA/V 20-28

Gain coefficient (grid 1 -grid 2) (at anode voltage 3 kV, grid 2 voltages 1 and 1.2 kV, anode current 1.5 A) 6-9

Anode current (at anode voltage 3 kV, grid 1 voltage -100 V, grid 2 voltage 1 kV), A, at most 1

Negative bias voltage (at anode voltage 8.5 kV, grid 2 voltage 1.2 kV, anode current 0.5 A), V 140-180

Interelectrode capacitance, pF:

input, at most 80

output, at most 29

transfer,at most 0.7

Output power (at anode voltage 10 kV, operating frequency 30 MHz), kW, at least 13

Limit Operating Values

Filament voltage, V 6-6.6

Anode voltage (DC), kV 10

Negative grid 1 voltage, V 800

Grid 2 voltage (DC), kV 2

Filament starting current, A 150

Dissipation, W:

anode 8x10³

grid 2 450

grid 1 200

Operating frequency at output power at least 13kW, MHz 30

Cutoff frequency, MHz 100

Anode temperature, °C 200

Temperature at envelope, stem and seals, °C 150

gu-39b-1(2)1.jpg
Averaged Anode Characteristic Curves:
U_f = 6.3V; U_g2 = 1kV

gu-39b-1(2)2.jpg
Averaged Anode Characteristic Curves:
U_f = 6.3V; U_g2 = 1.5kV

gu-39b-1(3)1.jpg
Averaged Anode-Grid Characteristic Curves:
U_f = 6.3V; U_g2 = 1kV

gu-39b-1(3)2.jpg
Averaged Anode-Grid Characteristic Curves:
U_f = 6.3V; U_g2 = 1.5kV

gu-39b-1(3)3.jpg
Averaged Characteristic Curves:
U_f = 6.3V; U_g2 = 1kV;
_____ grid 1-anode;
_ _ _ grid 2-anode

gu-39b-1(3)4.jpg
Averaged Grid 1 Characteristic Curves:
U_f = 6.3V; U_g2 = 1kV

gu-39b-1(3)5.jpg
Averaged Characteristic Curves:
U_f=6.3V;U_g2=1.5kV;
_____ grid 1-anode;
_ _ _ grid 2-anode

gu-39b-1(4)1.jpg
Averaged Grid 1 Characteristic Curves:
U_f = 6.3V; U_g2 = 1.5kV

gu-39b-1(4)2.jpg
Averaged Grid 2 Characteristic Curves:
U_f = 6.3V; U_g2 = 1kV

gu-39b-1(4)3.jpg
Averaged Grid 2 Characteristic Curves:
U_f = 6.3V; U_g2 = 1.5kV

OPERATING ENVIRONMENTAL CONDITIONS
Ambient temperature, °C	10 to + 55
Relative humidity at up to + 25 °C, %	98

BASIC DATA Electrical Parameters
Filament voltage, V	63
Filament current, A	85-105
Mutual conductance (at anode voltage 3 kV, grid 2 voltage 1 kV, anode currents 1.5 and 2 A), mA/V	20-28
Gain coefficient (grid 1 -grid 2) (at anode voltage 3 kV, grid 2 voltages 1 and 1.2 kV, anode current 1.5 A)	6-9

Anode current (at anode voltage 3 kV, grid 1 voltage -100 V, grid 2 voltage 1 kV), A, at most	1
Negative bias voltage (at anode voltage 8.5 kV, grid 2 voltage 1.2 kV, anode current 0.5 A), V	140-180
Interelectrode capacitance, pF:
input, at most	80
output, at most	29
transfer,at most	0.7
Output power (at anode voltage 10 kV, operating frequency 30 MHz), kW, at least	13

Limit Operating Values
Filament voltage, V	6-6.6
Anode voltage (DC), kV	10
Negative grid 1 voltage, V	800
Grid 2 voltage (DC), kV	2
Filament starting current, A	150
Dissipation, W:
anode	8x10³
grid 2	450
grid 1	200
Operating frequency at output power at least 13kW, MHz	30
Cutoff frequency, MHz	100
Anode temperature, °C	200
Temperature at envelope, stem and seals, °C	150