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GU-34B

TETRODE

The GU-34B tetrode is used for wideband power amplification at frequencies up to 250 MHz in RF equipment.

GENERAL
Cathode: indirectly heated, oxide-coated.
Envelope: glass-to-metal.
Cooling: forced air.
Height: at most 125 mm.
Diameter: at most 94 mm.
Mass: at most 1 kg.

gu-34b(1)1.jpg
KP - cathode and heater; P - heater; C1 - grid 1; C2 - grid 2: A - anode

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

BASIC DATA
Electrical Parameters

Heater voltage, V 12.6

Heater current, A 3.3-4

Mutual conductance (at anode voltage 1 kV, grid 2 voltage 500 V, anode current 500 mA), mA/V 22-34

Gain coefficient (grid 1 -grid 2, at anode voltage 1 kV, grid 2 voltage 400-500 V, anode current 500 mA) 19

Cutoff voltage (at anode voltage 1 kV, grid 2 voltage 500 V, anode current 5 mA), V, at most 80

Interelectrode capacitance, pF:

input, at most 63-73

output, at most 7-11

transfer, at most 0.12

Warm up time, min, at most 2.5

Output power, W, at least 400

Output power over 1.500 h of service, W, at least 320

Limit Operating Values

Heater voltage, V 13.9

Anode voltage, kV 4-103

Grid 2 voltage, V 600

Cathode current (DC component), mA 540

Dissipation, W:

anode 500

grid 2 20

grid 1 5

Frequency, MHz 250

Temperature at anode, stem and seals, °C 150

gu-34b(2)1.jpg
Averaged Anode Characteristic Curves:
U_f = 12.6V; U_g2 = 400V

Averaged Anode Characteristic Curves:
U_f = 12.6V; U_g2 = 500V

Averaged Grid 2-Anode Characteristic Curves:
U_f= 12.6V; U_g2 = 400V

Averaged Grid 2-Anode Characteristic Curves:
U_f = 12.6V; U_g2 = 500V

BASIC DATA Electrical Parameters
Heater voltage, V	12.6
Heater current, A	3.3-4
Mutual conductance (at anode voltage 1 kV, grid 2 voltage 500 V, anode current 500 mA), mA/V	22-34
Gain coefficient (grid 1 -grid 2, at anode voltage 1 kV, grid 2 voltage 400-500 V, anode current 500 mA)	19
Cutoff voltage (at anode voltage 1 kV, grid 2 voltage 500 V, anode current 5 mA), V, at most	80
Interelectrode capacitance, pF:
input, at most	63-73
output, at most	7-11
transfer, at most	0.12
Warm up time, min, at most	2.5
Output power, W, at least	400
Output power over 1.500 h of service, W, at least	320

Limit Operating Values
Heater voltage, V	13.9
Anode voltage, kV	4-103
Grid 2 voltage, V	600
Cathode current (DC component), mA	540
Dissipation, W:
anode	500
grid 2	20
grid 1	5
Frequency, MHz	250
Temperature at anode, stem and seals, °C	150