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GU-A

TETRODE

The GU-A 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.

gu-33a(1)1.jpg

OPERATING ENVIRONMENTAL CONDITIONS
Vibration loads:
frequency, Hz 10-200
acceleration, m/s² 59
frequency, Hz 200-600
acceleration, m/s² 20
Multiple impacts with acceleration, m/s² 343
Single impacts with acceleration, m/s² 1,470
Ambient temperature, °C -10 to +55
Relative Humidity at up to +25 S°, % 98

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

gu-33a(3)1.jpg
Averaged Characteristic Curves:
Uf = 6.3 V; Ug2 = 0.3 kV;
_____ anode;
- - - grid 2-anode;
Pa max

gu-33a(3)2.jpg
Averaged Grid-Anode Characteristic Curves:
Uf = 6.3V;
_____ Ug2 (0.25kV);
- - - Ug2 (0.3kV)

gu-33a(3)3.jpg
Averaged Anode-Grid Characteristic Curves:
Uf = 6.3V; Ua = 1kV