GI-50A

TRIODE

The GI-50A triode is used as a wide-band signal amplifier with a peak output power of up to 2 MW at frequencies up to 170 MHz.

GENERAL
Cathode: directly heated, carbonized thoriated tungsten.
Envelope: metal-ceramic with outer copper anode and ring leads of cathode and grid.
Cooling: forced (water for anode, air for stem and bulb).
Height: at most 420 mm.
Diameter: at most 210 mm.
Mass: at most 18 kg.

OPERATING ENVIRONMENTAL CONDITIONS
Vibration loads:
frequencies, Hz	5-80
acceleration, m/s²	24
Multiple impacts with acceleration, m/s²	118
Ambient temperature, °C	-60 to+70
Relative humidity at +40 °C, %	98

BASIC DATA Electrical Parameters
Filament voltage (AC or DC), V	13
Filament current, A	480-560
Negative cutoff voltage, absolute value (at anode voltage 10 kV, anode current 0.1 A), V, at most	450
Peak anode current (at anode voltage 3 kV, peak grid voltage 2 kV, negative grid voltage 250 V), A, at least	350
Peak grid current (at anode voltage 3 kV, peak grid voltage 2 kV, negative grid voltage 250 V), A, at most	105
Mutual conductance (at anode voltage 4 kV, anode currents 2.5 and 4.5 A), mA/V	65-85
Gain coefficient (at anode voltages 3 and 4 kV, anode current 4.5 A)	30-44
Cathode heating time, s, at most	15
Peak oscillatory power (at anode voltage 26 kV, pulse duration 1,000 µs, pulse 1/duty factor at least 40, frequency at most 170 MHz), MW, at least	2
Interelectrode capacitance, pF: input	160-185
output, at most	3.5
transfer	42-52

Limit Operating Values
Filament voltage (AC or DC), V:
maximum	13.7
minimum	12.3
Filament starting current, A	800
Peak anode voltage, kV	32
Dissipation, kW:
anode	40
grid	1
Minimum 1/duty factor	40
Maximum pulse duration, µs	1,000
Operating frequency, MHz	170
Temperature at metal-to-ceramic seals, °C	150

Characteristic Curves Showing Emission Current versus Anode and Grid Voltages

Averaged Characteristic Curves:
U_f = 15V;
_____ anode-grid;
_ _ _ grid

Averaged Characteristic Curves:
U_f = 13V;
_____ anode;
_ _ _ grid-anode