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GU-61 B

TETRODE

The GU-61 B tetrode is used for RF power amplification at frequencies up to 70 MHz

GENERAL
Cathode: directly heated, carbonized thoriated tungsten
Envelope: metal-ceramic with ring leads of
cathode and grids.
Cooling: forced air.
Height: at most 330 mm.
Diameter: at most 204 mm.
Mass: at most 18 kg

gu-61b(1)1.jpg
K1, K2 - cathode; C1 - grid 1; C2 - grid 2; A - anode; I - contact surfaces

OPERATING ENVIRONMENTAL CONDITIONS
Lowest permissible ambient temperature, °C -60
Relative humidity at up to +40 °C,% 95-98

BASIC DATA
Electrical Parameters
Filament voltage (AC or DC), V 6.3
Filament current, A 121-141
Resistance of unheated cathode, Om 0.005
Anode current, A, at least 5
Grid 2 current (at anode voltage 2 kV,
grid 2 voltage 1 kV, anode current 5 A), A, at most
0.7
Negative grid 1 cutoff voltage (at anode voltage 10 kV, grid 2 voltage 1.5 kV, anode current 0.1 A), V, at most 330
Mutual conductance (at anode voltage 2 kV, grid 2 voltage 1.25 kV, anode currents 5 and 7 A), mA/V 63-85
Gain coefficient (grid 1-grid 2) (at anode voltage 2 kV, grid 2 voltages 1.25 and 1 kV, anode current 5 A) 7-9
Oscillatory power (at 70 MHz), kW 30
Interelectrode capacitance, pF:
  common-cathode circuit common-grid circuit
input, at most 320 150
output, at most 38 38
transfer, at most 1.4 0.2

Limit Operating Values
Filament voltage (AC or DC), V 7.9-8.7
Filament starting current, A 190
Anode voltage (DC), kV 10
Grid 2 voltage (DC), kV 1.5
Dissipation, kW:
anode 25
grid 2 0.7
grid 1 0.3
Operating frequency at oscillator power output 30 kW, MHz 70
Temperature at stem and metal-to-ceramic seals, °C 175
Anode temperature, °C 250

gu-61b(2)1.jpg
Averaged Anode Characteristic Curves:
Uf = 8.3V; Ug2 = 1.5kV

gu-61b(2)2.jpg
Averaged Characteristic Curves:
Uf = 8.3V; Ug2 = 1.5kV;
_____ grid 1-anode;
_ _ _ grid 2-anode

gu-61b(3)1.jpg
Averaged Anode-Grid Characteristic Curves:
Uf = 8.3V; Ug2 = 1.5kV

gu-61b(3)2.jpg
Averaged Grid 1 Characteristic Curves:
Uf = 8.3V; Ug2 = 1.5kV

gu-61b(3)3.jpg
Averaged Grid 2 Characteristic Curves:
Uf = 8.3V; Ug2 = 1.5kV