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

K1, K2 - cathode; C1 - grid 1; C2 - grid 2; A - anode; I - contact surfaces

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

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

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

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

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

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

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