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Электронные лампы
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   Яндекс.Метрика


ГУ-78Б

TETRODE

The GU-78B tetrode is used for power amplification in distributed amplifiers and single-sideband signal amplifiers at frequencies up to 250 MHz, in RF industrial engineering equipment.

GENERAL

Cathode: indirectly heated, oxide-coated. Envelope: metal ceramic, with ring leads of cathode, grid 2 and anode and pin leads of grid 1. Cooling: forced air. Height: at most 120 mm. Diameter: at most 111 mm. Mass: at most 1.8kg.

OPERATING ENVIRONMENTAL CONDITIONS

Vibration loads:

frequencies, Hz ............. 1-60

acceleration, m/s2 ............ 20

Multiple impacts with acceleration, m/s2 ........... 150

Ambient temperature, ° С .............. -60 to+70

Relative humidity at up to +25 ° Сwithout moisture condensation, % ............ 98

BASIC DATA Electrical Parameters

Heater voltage (AC or DC), V ............... 27

Heater current, A ............... 3.4-4

Anode voltage, kV ........... 1.7

Grid 2 voltage, V ............ 300

Negative grid 1 bias voltage, V ............. 51-25

Negative cutoff voltage (at anode voltage 3 kV, anode current 20 mA), absolute value, V ........... -150

Anode current, A .......... 1.5

Anode current at zero grid 1 voltage (at anode voltage 250 V), mA, at most ............... 4.2

Grid 2 current at zero grid 1 voltage (at anode voltage 250 V), mA, at most ............ 0.9

Mutual conductance, mA/V ........... 40-80

Output power under amplification of class AB1, kW:

at heater voltage 27 V, at least ............ 2.5

at heater voltage 25.7 V, at least ........... 2.2

Common-cathode interelectrode capacitance, pF:

input ............ 100-150

output ............. 15-30

transfer, at most ............. 0.25

Limit Operating Values

Heater voltage (AC or DC), V ............. 25.5-28.3

Anode voltage, V:

DC .......... 3200

instantaneous value .............. 6200

Grid 2 voltage (DC), V ................ 350

Negative grid 1 voltage (DC, absolute value), V ............ 150

Cathode-heater voltage (either polarity, absolute value), V .............. 150

Cathode current (DC component), mA ........... 2200

Grid 1 current (DC component), mA ............ 25

Dissipation, W:

anode ........... 2500

grid 2 ........... 30

grid 1 ............ 1

Operating frequency, MHz ........... 250

Cathode heating time, s .......... 240

Envelope temperature at hottest point, °C ........... 200

   



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