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The GU-88A triode is a RF oscillator and power amplifier tube for use in stationary general-purpose RF equipment.

Cathode: directly heated, carbonized thoriated tungsten.
Envelope: metal-ceramic.
Cooling: water for anode, forced air for envelope other elements.
Height: at most 764 mm.
Diameter: at most 215 mm.
Mass: at most 33 kg.

K1, K2 - cathode; C - grid; A - anode

Electrical Parameters
Filament voltage (AC or DC), V 26
Filament current, A 640-720
Output power at frequencies up to 22 MHz, kW, at least 500
Mutual conductance (at anode voltage 1 kV, peak grid voltages 200 and 600 V), mA/V 380-620
Cathode emission current, A, at least 500
Static amplification factor (at anode voltages 1 and 2 kV, anode current 10 A) 36-54
Interelectrode capacitance, pF:
grid-anode, at most 200
grid-cathode, at most 500
anode-cathode, at most 7.5

Limit Operating Values
Filament voltage (AC or DC), V 24-26
Filament starting current (peak value), A 1,150
Anode voltage (DC), kV 12
Negative bias voltage, absolute value, V 500
Dissipation, kW:
anode 400
grid 7
Operating frequency, MHz 30
Envelope temperature at hottest point (except for anode), °C 175

Averaged Characteristic Curves:
_____ anode-grid;
_ _ _ grid