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The GS-27B tetrode is used for RF voltage amplification in grounded-grid circuits in RF equipment.

Cathode: indirectly heated.
Envelope: metal-ceramic.
Cooling: forced air.
Height: at most 72 mm.
Diameter: at most 37.3 mm.


Electrical Parameters
Heater voltage, V 11.4-13.8
Heater current, A 1.04-1.24
Mutual conductance, mA/V, at least 10
Peak cathode emission current, A, at least 5
Inverse grid 1 current, µA, at most 20
Output power, W, at least 40
Interelectrode capacitance, pF:
grid 1-cathode 6-9
grid 2-anode 2-3.5

Limit Operating Values
Heater voltage, V 11.4-13.8
Maximum anode dissipation, W 100
Maximum grid 1 dissipation, W 2
Maximum grid 2 dissipation, W 2
Maximum anode voltage, V 650
Maximum instantaneous anode voltage, V 1,800
Maximum grid 2 voltage, V 200
Maximum instantaneous grid 2 voltage, V 300
Bias voltage, V -50 to 0
Maximum anode current, mA 210
Maximum grid 1 current, mA 30
Grid 2 current (at grid 2 voltage not above 130V), mA -17 to +17
Warm up time, s, at most 60
Maximum operating frequency, MHz 1,000
Maximum envelope temperature, °C 200

Averaged Anode-Grid and Grid Characteristic Curves:
Uf = 12.6V; Ua = 1,000V;
_____ Ia;
_ _ _ Ig1

Averaged Anode and Grid-Anode Characteristic Curves:
Uf = 12.6V; Ug2 = 200V;
_____ Ia;
_ _ _ Ig1;
- . - Ig2