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GU-94A

TETRODE

The GU-94A tetrode is designed for use in stationary pulse-modulation RF equipment at frequencies up to 2 MHz for output power 150 kW and at up to 30 MHz for output power 100 kW.

GENERAL
Cathode: directly heated, carbonized thoriated tungsten.
Envelope: metal-ceramic.
Cooling: forced (water for anode, air for other envelope elements)
Working position: upright with anode up or down.
Height: at most 535 mm.
Diameter: at most 221 mm.
Mass at most 35 kg.

gu-94a(1)00031.jpg

OPERATING ENVIRONMENTAL CONDITIONS
Vibration loads:
frequencies, Hz 1-35
acceleration, m/s² 5
Multiple impacts with acceleration, m/s² 150
Ambient temperature, °C 1-55
Relative humidity at up to 25 °C, % 98

BASIC DATA
Electrical Parameters
Filament voltage (AC or DC), V 18
Filament current, A 340-420
Peak anode current (at filament voltage 18 V, anode voltage 2.5 kV, grid 2 voltage 1.5 kV, grid 1 voltage 0), A, at least 38
Negative cutoff voltage, absolute value (at filament voltage 18 V, anode voltage 2 kV, grid 2 voltage 1.5 kV, grid 1 voltage 0), V, at most 350
Mutual conductance (at filament voltage 18 V, anode voltage 2 kV, grid 2 voltage 1.5 kV, anode current 6 and 10A),mA/V 110-180
Cathode emission current (at filament voltage 18 V, anode voltage 1 kV, grid 2 voltage 1 kV), A, at least 190
Output power (at anode voltage 12 kV), kW:
at 2 MHz, at least 150
at 26 MHz, at least 100
Interelectrode capacitance in agrounded-cathode circuit, pF:
input 550-650
output 60-77
transfer, a most 2.6

Limit Operating Values
Filament voltage, V 18.5
Anode voltage (DC), kV:
in modulation mode 15
in anode-screen modulation mode 12.5
Grid 2 voltage (DC), kV:
in modulation mode 1.8
in anode-screen modulation mode 0.9
Negative bias voltage, absolute value, kV 0.6
Filament starting current (peak value), A 800
Dissipation, kW:
anode 160
grid 2 2.5
grid 1 0.5
Operating frequency, MHz 30
Envelope temperature, °C 175

gu-94a(3)00051.jpg
Emission Characteristic Curves

gu-94a(3)00052.jpg
Anode-Grid Characteristic Curves:
Uf = 18V; Ug2 = 1,000V

gu-94a(3)00053.jpg
Anode-Grid Characteristic Curves:
Uf = 18V; Ug2 = 1,500V

gu-94a(3)00054.jpg
Grid Characteristic Curves:
Uf=18V; Ua = 1.8kV

gu-94a(3)00055.jpg
Grid Characteristic Curves:
Uf = 18V; Ug2 = 1,000V

gu-94a(3)00056.jpg
Grid Characteristic Curves:
Uf = 18V; Ug2 = 1,500V