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GU-33 B

TETRODE

The GU-B tetrode is designed to operate for wide-band power amplification at frequencies up to 500 MHz in RF equipment.

GENERAL
Cathode: indirectly heated, oxide-coated.
Envelope: glass-to-metal.
Cooling: forced air.
Height: at most 85 mm.
Diameter: at most 50 mm.
Mass: at most 220 g.

gu-33b(1)1.jpg
KP - cathode and heater; P - heater; C2 - grid 2; C1 - grid 1; A - anode

OPERATING ENVIRONMENTAL CONDITIONS
Vibration loads:
frequencies, Hz 16-60
acceleration, m/s² 25
Multiple impacts with acceleration, m/s² 118
Ambient temperature, °C -10 to +55
Relative humidity at up to 25 °C, % 98

Negative cutoff voltage (at anode voltage 1,000 V, grid 2 voltage 300 V, anode current 5 mA), V (absolute value), at most
BASIC DATA
Electrical Parameters
Heater voltage, V 6.3
Heater current, A 4.7-5.6
Mutual conductance (at anode voltage 400 V, grid 2 voltage 300 V, anode current 375 mA), mA/V 20-32
Gain coefficient (at anode voltage 400 V, grid 2 voltage 300 V, anode current 375 mA) 13
Negative bias voltage (at anode voltage 400 V, grid 2 voltage 300 V, anode current 375 mA), V (absolute value), at most 2-12
60
Interelectrode capacitance, pF:
input, at most 36-46
output, at most 7-10
transfer, at most 0.1
Output power, W, min.:
at 50-60 MHz, anode voltage 1 kV, grid 2 voltage 250 V, grid 1 voltage 40 V, drive voltage 52 V peak value, grid 2 current almost 40 mA, anode dissipation at most 150 W, grid 1 dissipation at most 2 W) 120
over 1.500 h of service 105
Warm up time (at anode voltage 400 V and grid 2 voltage 300 V) mm at most 2.5

Limit Operating Values
Heater voltage, V 5.7-6.9
Anode voltage (DC), V 1500
Grid 2 voltage, V 400
Cathode current (DC component), mA 340
Cathode current under conditions of class , mA (peak value) 1000
Dissipation, W:
anode 150
grid 1 2
grid 2 10
Operating freguency, MHz 500
Temperature at anode, stem and glass-to-metal seals, °C 150

gu-33b(2)1.jpg
Averaged Anode Characteristic Curves
Uf = 6.3V; Ug2 = 300V

gu-33b(2)2.jpg
Averaged Grid-Anode Characteristic Curves
Uf = 6.3V; Ug2 = 300V