GU-ÇÇA

TETRODE

The GU-ÇÇA tetrode is designed for continuous operation at frequencies up to 500 MHz in separate-excitation or self-excitation oscillator circuits and is suitable for use in both stationary and mobile RF equipment

GENERAL
Cathode: indirectly heated, oxide-coated.
Envelope: glass-to-metal.
Cooling: liquid.
Height: at most 85 mm.
Diameter: at most 45 mm.
Mass: at most 130 g.

BASIC DATA Electrical Parameters
Heater voltage, V	6.3
Heater current, A	4.7-5.6
Mutual conductance iat anode voltage 400 V grid 2 voiiage 300 V grid 1 voltage change ±l kV anode current 375 mA), mA/V	20-32
Gain coefficient (at anode voltage 400 V grid 2 voltages 250 and 300 V, anode current 375 mA)	8-16
Negative bias voltage (at anode voltage 400 V grid 2 voltage 300 V, anode current 375 mA/V (absolute value), at most	60
Output power (at frequency 250 MHz, anode voltage 900 V grid 2 voltage 300 V, anode current at most 310 mA, grid 2 current 33 mA, anode dissipation, at most 150 W), W, at least	120
Warm up time (at anode voltage 400 V grid 2 voltage 300 V, anode current 375 mA), s, at most	120
Output power over 1000 h of service (at 50-60 MHz, anode voltage 1.000 V grid 2 voltage 250 V grid 1 voltage -40 V, drive voltage 52 V grid 2 current at most 40 mA, anode dissipation at most 1 50 W grid 1 dissipation at most 2 W), W, at least	105
Interelectrode capacitance, pF:
input, at most	34-44
output, at most	7-10
transfer, at most	0.1

Limit Operating Values
Heater voltage, V	5.7-6.9
Anode voltage, V	1,500
Grid 2 voltage, V	400
Negative grid 1 voltage, V (absolute value)	200
Cathode current (DC component), mA	340
Cathode current under conditions of class B, mA (peak value)	1,000
Dissipation, W:
anode	150
grid 2	10
grid 1	2
Operating frequency, MHz	500
Temperature at seals, anode and stem, °C	150

Averaged Characteristic Curves:
U_f = 6.3 V; U_g2 = 0.3 kV;
_____ anode;
- - - grid 2-anode;
— • — P_{a max}

Averaged Grid-Anode Characteristic Curves:
U_f = 6.3V;
_____ U_g2 (0.25kV);
- - - U_g2 (0.3kV)

Averaged Anode-Grid Characteristic Curves:
U_f = 6.3V; U_a = 1kV

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