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GU-68P

TRIODE

The GU-68P triode is used as a power amplifier at frequencies up to 30 MHz in stationary RF transmitters.

GENERAL
Cathode: directly heated, carbonized thoriated tungsten.
Envelope: metal-ceramic.
Cooling: forced (evaporation for anode, air for stem and bulb).
Height: at most 540 mm.
Diameter: at most 244 mm.
Mass: at most 35 kg.

gu-68p(1)00021.jpg

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

BASIC DATA
Electrical Parameters
Filament voltage, V 20
Filament current, A 300-330
Mutual conductance (at anode voltage 1 kV, anode currents 10 and 14A),mA/V 115-145
Gain coefficient (at anode voltages 1 and 2 kV, anode current 10 A) 30-38
Anode current (at anode voltage 0.3 kV, grid voltage 100 V), A, at least 8
Negative cutoff voltage (at anode voltage 10 kV, anode current 0.1 A), absolute value, V, at most 400
Interelectrode capacitance, pF:
input, at most 300
output, at most 6
transfer, at most 105
Output power (at 30 MHz, at filament voltage 20 V and anode voltage 12 kV), kW 250

Limit Operating Values
Filament voltage (AC or DC), V 19-21
Anode voltage (DC), kV 12
Negative outoff voltage, absolute value, kV 1.5
Filament starting current, A 450
Dissipation, kW:
anode 130
grid 2.3
Operating frequency, MHz 30
Temperature at stem and metal-to-ceramic seals, °C 175

gu-68p(2)00031.jpg
Averaged Anode Characteristic Curves

gu-68p(2)00032.jpg
Averaged Characteristic Curves:
_____ anode;
_ _ _ grid

gu-68p(2)00033.jpg
Averaged Grid-Anode Characteristic Curves