GI31
TRIODE
The GI31 triode is used as a RF oscillator for pulsed operation with anode keying in the decimetric wavelength range.
GENERAL
Cathode: indirectly heated, oxidecoated.
Envelope: metalceramic.
Height: at most 35 mm.
Diameter: at most 25.8 mm.
Mass: almost 18g.
A  anode; C  grid; KP  cathode and heater; P  heater
OPERATING ENVIRONMENTAL CONDITIONS  
Vibration loads:  
frequencies, Hz  1600 
acceleration, m/s²  98 
Multiple impacts with acceleration, m/s²  392 
Single impacts with acceleration, m/s²  4,900 
Linear loads with acceleration, m/s²  980 
Ambient temperature, °C  60 to +100 
Relative humidity at up to +35 °C, %  98 
BASIC DATA Electrical Parameters 

Heater voltage (AC or DC), V  6.3 
Heater current, A  0.91 
Inverse grid current, µA, at most  2 
Mutual conductance (at anode voltage 350 V, anode current 35 mA), mA/V, at least  15 
Peak cathode emission current (at peak anode and grid voltages 200 V, pulse duration 46 µs), A, at least  15 
Peak power output (at peak anode voltages 2.5 kV, peak anode current 2.1 A, pulse duration 3 µs), 1/duty factor 500, wavelength 1414.5 cm) kW at least  1.5 
Interelectrode capacitance, pF:  
input  3.5 
outut,at most  0.04 
transfer  22.7 
Limit Operating Values  
Heater voltage, V  66.6 
Peak anode voltage, kV  2.8 
Dissipation, W:  
anode  12 
grid  0.5 
Peak anode current, A  2.5 
Peak grid current, A  1.3 
Envelope temperature, °C  200 
Warm up time, s  15 
Operating frequency, MHz  2,100 
Maximum pulse duration, µs, at most  3 
Minimum 1/duty factor, at least  400 
Standard Operating Conditions (Anode Keying) 

Heater voltage, V  6.3 
Peak anode voltage, kV  2.5 
Peak anode current, A  2.1 
Pulse duration, µs  0.63 
1/duty factor  500 
Wavelength, cm, at least  14 
Peak power output, W  1,500 
Averaged Characteristic Curves in Pulsed Operation:
U_{f} = 6.3V; t = 1µs; frequency 2,000 imp/s
Averaged AnodeGrid Characteristic Curves in Pulsed Operation:
U_{f} = 6.3V; t = 1µs; frequency 2,000 imp/s
Averaged Characteristic Curves Showing Peak Oscillator Output Power versus Anode Voltage:
U_{f} = 6.3V
Averaged Characteristic Curves of Efficiency versus Anode Voltage:
U_{f} = 6.3V