GU-68A

TRIODE

The GU-68A triode is used for power amplification at up to 30 MHz in stationary RF transmitters.

GENERAL
Cathode: directly heated, carbonized thoriated tungsten.
Envelope: metal-ceramic.
Cooling: forced (water for anode, air for stem).
Height: at most 530 mm.
Diameter: at most 215 mm.
Mass: at most 24 kg.

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 14 A), mA/V	115-145
Gain coefficient (at anode voltage 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

Limit Operating Values
Filament voltage (AC or DC), V	19-21
Anode voltage (DC), kV	12
Cutoff 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

Averaged Anode Characteristic Curves

Averaged Characteristic Curves:
_____ anode-grid;
_ _ _ grid

Averaged Grid-Anode Characteristic Curves

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