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The GI-53 triode is used as a RF oscillator in grounded-grid circuits.

Cathode: indirectly heated, oxide-coated.
Envelope: metal-ceramic with disc-type leads
of electrodes and a rigid lead of heater.
Height: at most 44 mm.
Diameter: at most 23 mm.
Mass: at most 25 g.


Vibration loads:
frequencies, Hz 5-2,000
acceleration, m/s² 147
Multiple impacts with acceleration, m/s² 1,470
Single impacts with acceleration, m/s² 19,600
Ambient temperature, °C -60 to +125
Relative humidity at +40 °C, % 95-98

Electrical Parameters
Heater voltage (AC or DC), V 1.8
Heater current, A 1.5-3
Anode voltage, V 150
Negative grid voltage, V 3
Negative cutoff voltage (at anode voltage 1.55 kV, anode current 200 µA), V, at most 95
Anode current, mA 2-7.2
Inverse grid current (at heater voltage 1.8 V, grid voltage -3V, anode voltage 150 V), µA, at most 20
Mutual conductance, mA/V 2.5-6
Gain coefficient 20-40
Warm up time, s, at most 3
Peak output power (at heater voltage 1.8 V, grid voltage -100 V, anode voltage 1.55 kV, peak grid voltage 120 V, resistance 10 Om in cathode circuit, frequency 900 MHz, pulse duration 3 µs, 1/duty factor 300), W, at least 800
Interelectrode capacitance, pF:
input 5-8.5
output, at most 0.3
transfer 3-6

Limit Operating Values
Heater voltage (AC or DC), V:
maximum 1.9
minimum 1.7
Anode voltage (DC), kV 1.6
Grid voltage (DC), V -200
Peak grid voltage (negative overshoot) at pulse duration at most 1 µs, V 150
Dissipation, W:
anode (with heat sink) 10
anode 6
grid 0.5
Peak anode current at pulse duration 3 µs and 1/duty factor 300, A 2
Peak cathode current at pulse duration 3 µs and 1/duty factor 300, A 2.5
Maximum pulse duration µs 3.3
Maximum wavelength, cm 15
Minimum 1/duty factor 300
Anode seal temperature, °C 200
Resistance in grid circuit, kOm 1