
GI46B
TRIODE
The GI46B triode generates and amplifies RF oscillations in continuouswave and pulsed operation with anode modulation.
GENERAL
Cathode: indirectly heated,
oxidecoated.
Envelope: metalcaramic 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.
OPERATING ENVIRONMENTAL CONDITIONS  
Vibration loads:  
frequencies, Hz  51,000 
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, %  9598 
BASIC DATA Electrical Parameters  
Heater voltage (AC or DC), V  12.6 
Heater current, A  2.32.6 
Anode voltage (DC), kV  2 
Mutual conductance (at anode current 80 mA), mA/V  1726 
Inverse grid current (at anode current 80 mA), µA  40 
Cathode emission current (at anode pulse voltage 400 V, pulse duration 25 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), %  0.40.8 
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  14.518.5 
transfer  5.16.4 
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  7.659.35 
Anode voltage, kV  1.5 
Anode current, mA  350 
Wavelength, cm  28 
Output power, W:  
in selfexcited 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 