GS-3B

BEAM-POWER TETRODE

The GS-3B beam-power tetrode amplifies RF power.

GENERAL
Cathode: indirectly heated, oxide-coated.
Envelope: metal-ceramic.
Cooling: forced water.
Height: at most 165 mm.
Diameter: at most 121 mm.
Mass: at most 3.5 kg.

BASIC DATA Electrical Parameters
Heater voltage (AC or DC), V	26
Heater current, A	3.2-3.8
Mutual conductance (at anode voltage 1,500 V, grid 2 voltage 600 V, grid 1 voltage change -10V and anode current 1.5 A), mA/V	30-50
Gain coefficient (grid 1 -grid 2) (at anode voltage 2,000 V, grid 2 voltage 500 V, grid 2 voltage change -50 V and anode current 1 A)	8-13
Output power (at anode voltage 2,500 V, grid 2 voltage 600 V, anode current 2 A, driving power 250 V, wavelength 50 cm), kW, at least	1.5
Interelectrode capacitance, pF:
input	25-35
output, at most	0.07
transfer	15-21

Limit Operating Values
Heater voltage (AC or DC), V	23-26
Maximum anode voltage (DC), kV	2.1
Maximum grid 2 voltage, V	500
Maximum driving power, W	300
Maximum dissipation, W:
anode	2x103
grid 1	45
grid 2	60
Maximum anode current, A	1.6
Operating frequency, MHz:
maximum	800
minimum	300
Maximum warm up time, s	120
Maximum anode temperature, °C	180
Maximum temperature, °C:
cathode lead	90
grids lead	120

Averaged Anode Characteristic Curves:
U_f = 26V; U_g2 - 500V

Averaged Anode-Grid Characteristic Curves:
U_f = 26V; U_a = 2kV

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