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The GU-94P tetrode provides linear amplification of single-sideband signals with output power 100 kW at frequencies up to 30 MHz and is designed for stationary use in RF equipment.

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


Vibration loads:
frequencies, Hz 1-35
acceleration, m/s² 5
Multiple impacts with acceleration, m/s² 147
Ambient temperature, °C 1-55
Relative humidity at up to 25 °C, % 98

Electrical Parameters
Filament voltage (AC or DC), V 18
Filament current, A 350-420
Negative cutoff voltage, absolute value (at anode voltage 2 kV, grid 2 voltage 1.5 kV, anode current 0.1 A), V, at most 350
Anode current (at anode voltage 2.5 kV, peak grid 2 voltage 1.5 kV, grid 1 voltage 0), A, at least 38
Mutual conductance (at anode voltage 2 kV, grid 2 voltage 1.5 kV, anode currents 6 and 10 A), mA/V 110-180
Gain coefficient (at anode voltage 2 kV, grid 2 voltages 1.4 and 1.5 kV, anode current 10 A) 6-11
Interelectrode capacitance in a grounded-cathode circuit, pF:
input 550-650
output 60-77
transfer 2.6
Interelectrode capacitance in a grounded-grid circuit, pF:
input 240-300
output 60-77
transfer, at most 0.35

Limit Operating Values
Filament voltage (AC or DC), V 18.5
Anode voltage (DC), kV 15
Grid 2 voltage, kV 1.8
Filament starting current (peak value), A 800
Dissipation, W:
anode 1x105
grid 2 2.5x10³
grid 1 500
Operating fequency, MHz 30
Envelope temperature (except for anode) at the hottest point, °C 175

Averaged Emission Characteristic Curves

Averaged-Grid Characteristic Curves:
Uf = 18V; Ug2 = 1,500V

Averaged Anode-Grid Characteristic Curves:
Uf = 18V; Ug2 = 1,500V