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GI-46B

TRIODE

The GI-46B triode generates and amplifies RF oscillations in continuous-wave and pulsed operation with anode modulation.

GENERAL
Cathode: indirectly heated, oxide-coated.
Envelope: metal-caramic with ring leads of cathode, heater and grid.
Cooling: forced air.
Height: at most 113 mm with heat sink, 69 mm with no heat sink.
Diameter: at most 65 mm with heat sink, 55 mm with no heat sink.
Mass: at most 620 g with heat sink, 205 g with no heat sink.

gi-46b(2)00081.jpggi-46b(2)00082.jpggi-46b(2)00083.jpg
A - anode; C - grid; KP - cathode and heater; P - heater

OPERATING ENVIRONMENTAL CONDITIONS
Vibration loads:
frequencies, Hz 5-1,000
acceleration, m/s² 98
Multiple impacts:
acceleration, m/s² 1,470
number of impacts 4,000
Ambient temperature, °C -60 to +100
Relative humidity at +40 °C, % 95-98

BASIC DATA
Electrical Parameters
Heater voltage (AC or DC), V 12.6
Heater current, A 2.3-2.6
Anode voltage (DC), kV 2
Mutual conductance (at anode current 80 mA), mA/V 17-26
Inverse grid current (at anode current 80 mA), µA 40
Cathode emission current (at anode pulse voltage 400 V, pulse duration 2-5 µs, frequency 50 Hz, grid pulse voltage 400 V), A, at least 24
Penetration factor (at anode current 80 mA, anode voltage change 200 V), % 0.4-0.8
Output power in CW generation mode (at heater voltage 8.5 V, anode voltage 1.5 kV, anode current 350 mA, wavelength 29 cm), W, at least 120
Warm up time, s, at most 100
Interelectrode capacitance, pF:
input 14.5-18.5
transfer 5.1-6.4

Limit Operating Values
Heater voltage (AC or DC), V:
maximum 13.9
minimum 7.7
Anode voltage (DC), kV 1.9
Peak anode voltage, kV 15
Dissipation, W:
anode 350
grid 20
Anode current (DC component), mA 350
Peak anode current, A 15
Maximum 1/duty factor 500
Maximum pulse duration, µs 15
Maximum resistance in grid circuit, kH 10
Temperature, °C:
anode lead 200
grid lead 200
cathode lead 120

STANDARD OPERATING CONDITIONS
CW Operation
Heater voltage, V 7.65-9.35
Anode voltage, kV 1.5
Anode current, mA 350
Wavelength, cm 28
Output power, W:
in self-excited oscillator mode 120
in amplifier mode 150

Pulsed Operation
Heater voltage, V 12.6
Peak anode voltage, kV 10
Peak anode current, A 12
Pulse duration, µs 10
Peak output power, kW 30
1/duty factor 1,000
Wavelength, cm 28
Air flow rate for envelope cooling, m³/h 24

NOTE
The tube can be supplied with no heat sink or with a heat sink of variant I or with a heat sink of variant II.

The heat sink of variant I providing more effective cooling is to be used only when the tube is employed as an oscillator with a high average value of anode dissipation.

gi-46b(4)00101.jpg
Averaged Anode Characteristic Curves

gi-46b(4)00102.jpg
Characteristic Curves Showing Oscillator Output Power versus Anode Voltage in Continuous-Wave Operation

gi-46b(4)00103.jpg
Characteristic Curve Showing Heater Voltage versus Output Power (at wavelength range 20-60 cm)

gi-46b(4)00104.jpg
Characteristic Curve of Relative Change of Peak Power versus 1/Duty Factor