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.

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

Emission Characteristic Curves

Anode-Grid Characteristic Curves:
U_f = 18V; U_g2 = 1,000V

Anode-Grid Characteristic Curves:
U_f = 18V; U_g2 = 1,500V

Grid Characteristic Curves:
U_f=18V; U_a = 1.8kV

Grid Characteristic Curves:
U_f = 18V; U_g2 = 1,000V

Grid Characteristic Curves:
U_f = 18V; U_g2 = 1,500V

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