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

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

Averaged Characteristic Curves:
U_f = 8.3V; U_g2 = 500V

Averaged Anode Characteristic Curves:
U_f = 8.3V; U_g2 = 1kV

Averaged Anode Characteristic Curves:
U_f = 8.3V; U_g2 = 1.5kV

Averaged Characteristic Curves:
U_f = 8.3V; U_g2 = 500V;
_____ grid 1-anode;
_ _ _ grid 2-anode

Averaged Anode-Grid Characteristic Curves:
U_f = 8.3V; U_g2 = 500V

Averaged Anode-Grid Characteristic Curves:
U_f = 8.3V; U_g2 = 1kV

Averaged Anode Characteristic Curves:
U_f = 8.3V; U_g2 = 1.5kV

Averaged Characteristic Curves:
U_f = 8.3V; U_g2 = 1kV;
_____ grid 1-anode;
_ _ _ grid 2-anode

Averaged Characteristic Curves:
U_f = 8.3V; U_g2 = 1.5kV;
_____ grid 1-anode;
_ _ _ grid 2-anode

Averaged Grid 1 Characteristic Curves:
U_f = 8.3V; U_g2 = 500V

Averaged Grid 1 Characteristic Curves:
U_f = 8.3V; U_g2 = 1kV

Averaged Grid 1 Characteristic Curves:
U_f = 8.3V; U_g2 = 1.5kV

Averaged Grid 2 Characteristic Curves:
U_f = 8.3V; U_g2 = 500V

Averaged Grid 2 Characteristic Curves:
U_f = 8.3V; U_g2 = 1kV

Averaged Grid 2 Characteristic Curves:
U_f = 8.3V; U_g2 = 1.5kV

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