GU-76 B

TETRODE

The GU-76B power tetrode is used for RF signal amplification, including single-sideband signals, in stationary and mobile equipment not operating in motion.

GENERAL
Cathode: directly heated, carbonized thoriated tungsten.
Envelope: metal ceramic, with outer copper anode.
Cooling: forced air.
Height: at most 341 mm.
Diameter: at most 224 mm.
Mass: at most 20 kg.

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

BASIC DATA Electrical Parameters
Filament voltage, V	11
Filament current, A	150-190
Mutual conductance (at anode voltage 2 RV, grid 2 voltage 1.3 kV, anode currents Sand 11 A), mA/V	85-115
Gain coefficient (at anode voltage 2 kV, grid 2 voltages 1 and 1.3 kV, anode current 8 A)	6-9
Anode current (at anode voltage 2 kV, grid 2 voltage 1.3 kV), A, at least	14.5
Negative bias voltage (at anode voltage 10 kV, grid 2 voltage 1.3 kV, anode current 2 A), absolute value	170-200
Negative cutoff voltage (at anode voltage 10 kV, grid 2 voltage 1.3 kV, anode current 0.3 A), absolute value, at most	270
Interelectrode capacitance, pF:
input	350-385
output	35-45
transfer, at most	2.2
Output power (at filament voltage 11 V, anode voltage 10 kV, grid 2 voltage 1.3 kV, grid 1 voltage -250 V), kW, at least	40
Output power (corresponding to the current of singlesideband signal envelope at filament voltage 11 V, anode voltage 10 kV, grid 2 voltage 1.3 kV), kW, at least	30
Relative level of combination components (at output power at least 30 kW, filament voltage 11 V, anode voltage 10 kV, grid 2 voltage 1.3 kV, anode quiescent current 2A),dB:
third-order components, at most	-39
fifth-order components, at most	-40

Limit Operating Values
Filament voltage (AC or DC), V	10.5-11.5
Filament starting current, A	280
Anode voltage (DC), kV	11
Grid 2 voltage (DC), kV	1.5
Negative grid 1 voltage (instantaneous value), absolute value, V	700
Dissipation, W:
anode	3x10³
grid 2	900
grid 1	300
Operating frequency, MHz	75
Anode temperature, °C	250
Temperature at hottest point of envelope, °C	200

Averaged Characteristic Curves:
U_f = 11V; U_g2 = 1.5kV;
_____ anode:
_ _ _ P_{a max}

Averaged Grid-Anode Characteristic Curves:
U_f = 11V; U_g2 = 1.5kV;
_____ grid 2;
_ _ _ grid 1

Averaged Anode-Grid Characteristic Curves:
U_f = 11V; U_g2 = 1.5kV

Averaged Characteristic Curves:
U_f = 11V; U_g2 = 1.5kV;
_____ grid 2;
_ _ _ grid 1

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