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The GU-66A triode is used for power amplification at up to 30 MHz in grounded-grid or grounded-cathode circuits in stationary RF transmitters.

Cathode: directly heated, carbonized thoriated tungsten.
Envelope: metal-ceramic with ring leads of cathode and grid.
Cooling: forced (water for anode, air for stem).
Height: at most 420 mm.
Diameter: at most 183 mm.
Mass: at most 16 kg.


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

Electrical Parameters
Filament voltage (AC or DC), V 13.5
Filament current, A 200-250
Negative cutoff voltage (at anode voltage 10 kV, anode current 0.1 A), absolute value, V, at most 300
Mutual conductance (at anode voltage 2 kV, anode currents 6 and 12 A), mA/V 95-125
Gain coefficient (at anode voltage 4 kV, anode current 8 A) 39-53
Output power (at anode voltage 10 kV), kW, at least 100
Interelectrode capacitance, pF:
input, at most 160
output, at most 3
transfer, at most 55

Limit Operating Values
Maximum filament voltage (AC or DC), V 14
Filament starting current, A 360
Anode voltage (DC), kV 10
Cutoff voltage (instantaneous value), absolute value, kV -1.5
Dissipation, kW:
anode 60
grid 1.3
Operating frequency, MHz 30
Temperature at stem and metal-to-ceramic seals, °C 200

Averaged Characteristic Curves:
Uf = 13.5V;
_____ anode-grid;
_ _ _ grid

Averaged Grid-Anode Characteristic Curves:
Uf = 13.5V