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GU-61P

TETRODE

The GU-61 P 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 of anode: evaporation
Height: at most 330 mm
Diameter: at most 204 mm
Mass: at most 17 kg

gu-61p(2)1.jpg

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

BASIC DATA
Electrical Parameters
Filament voltage (AC or DC), V 6.3
Filament current, A 121-145
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 40
transfer, at most 1.4 0.2

Limit Operating Values
Filament voltage (AC or DC), V 7.9-8.7
Filament starting current, A 210
Anode voltage (DC), kV 10
Grid 2 voltage (DC), kV 1.5
Dissipation, kW:
anode 30
grid 2 0.7
grid 1 0.3
Operating frequency at oscillator power output 30 kW, MHz 70
Temperature at stem and ceramic-to-metal seals, °C 175

gu-61p(3)1.jpg
Averaged Characteristic Curves:
Uf = 8.3V; Ug2 = 500V

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

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

gu-61p(3)4.jpg
Averaged Characteristic Curves:
Uf = 8.3V; Ug2 = 500V;
_____ grid 1-anode;
_ _ _ grid 2-anode

gu-61p(4)1.jpg
Averaged Anode-Grid Characteristic Curves:
Uf = 8.3V; Ug2 = 500V

gu-61p(4)2.jpg
Averaged Anode-Grid Characteristic Curves:
Uf = 8.3V; Ug2 = 1kV

gu-61p(4)3.jpg
Averaged Anode Characteristic Curves:
Uf = 8.3V; Ug2 = 1.5kV

gu-61p(4)4.jpg
Averaged Characteristic Curves:
Uf = 8.3V; Ug2 = 1kV;
_____ grid 1-anode;
_ _ _ grid 2-anode

gu-61p(4)5.jpg
Averaged Characteristic Curves:
Uf = 8.3V; Ug2 = 1.5kV;
_____ grid 1-anode;
_ _ _ grid 2-anode

gu-61p(5)1.jpg
Averaged Grid 1 Characteristic Curves:
Uf = 8.3V; Ug2 = 500V

gu-61p(5)2.jpg
Averaged Grid 1 Characteristic Curves:
Uf = 8.3V; Ug2 = 1kV

gu-61p(5)3.jpg
Averaged Grid 1 Characteristic Curves:
Uf = 8.3V; Ug2 = 1.5kV

gu-61p(5)4.jpg
Averaged Grid 2 Characteristic Curves:
Uf = 8.3V; Ug2 = 500V

gu-61p(5)5.jpg
Averaged Grid 2 Characteristic Curves:
Uf = 8.3V; Ug2 = 1kV

gu-61p(5)6.jpg
Averaged Grid 2 Characteristic Curves:
Uf = 8.3V; Ug2 = 1.5kV