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4CX2500A/GU84B
SVETLANA POWER TRANSMITTING TETRODE
The GU84B is a ceramicmetal forcedair cooled tetrode intended for use in power amplifiers with distributed amplification and for SSBsignal amplification with output power up to 2.5 kW at frequencies up to 75 MHz as well as for power amplification at frequencies up to 250 MHz with output power up to 2.2 kW in radiotechnical equipment.
The Svetlana 4CX2500/GU84B is manufactured in the Svetlana factory in St. Petersburg, Russia.
GU84b is the military version of the Svetlana tetrodes.Typical use would be transmitters "PLAMYA" ("FLAME"eng.),used on submarines.In emergency mode GU84B can work without cooling aproximately 2030 minutes.Many amateur radio stations see 4 KW in SSB and CW modes. They use GU84B in longlasting contests.
CHARACTERISTICS:
Intermodulation distortion of the 3rd order  minus 35 dB
Anode Dissipation  2.5 kW
Screen Dissipation  30 W
Grid Dissipation  1 W
Frequency for Max. Ratings 250 MHz
Cathode... Oxide coated Heater voltage  27 V
Heater current  3.7A
Transconductance at Ua= 1.5 kV Ug2 = 375 V Ia = 2 A >75 mA/V
Capacitance Input /Output /Feedthrough / 115 pF /23 pF/0.2 pF > Max
Seal and Envelope Temperature 200° C
Maximum Length 115 mm Maximum Diameter 99 mm
Weight1.4 k g
Operating Position Any
Blower 120 m3/h
The GU84B tetrode is used for power amplification in travelingwave and singlesideband signal amplifier circuits and as power amplifiers in RF equipment. GENERAL
Cathode: indirectly heated, oxidecoated.
Envelope: metal ceramic.
Cooling: forced air.
Height: at most 112 mm.
Diameter: at most 99 mm.
Mass: at most 1.3 kg.
OPERATING ENVIRONMENTAL CONDITIONS
Vibration loads: frequencies, Hz 180
acceleration, m/ s 2 49
Multiple impacts with acceleration, m/ s 2 147
Ambient temperature, °C 10 to+ 70
Relative humidity at up to +35 °C, 98%
BASIC DATA Electrical Parameters
Heater voltage, V 27
Heater current, A 3.44.0
Negative bias voltage (at anode voltage 750 V, grid 2 voltage 375 V, anode current 2000 mA), absolute value, V 1050
Grid 1 cutoff voltage (at anode voltage 2000 Volts grid 2 voltage 375 V, anode current 20 mA, anode resistance 0.5 k
absolute value, V, at most 150
Zero anode current (at anode voltage 250 V, grid 2 voltage 375 V, grid 1 voltage 0), A 3.56
Grid 1 reverse current (at anode voltage 1000 V,
grid 2 voltage 375 V, anode current 2000 mA) µ A, at most 80
Grid 2 current (at anode voltage 750 V, grid 2 voltage 375 V, anode current 2000 mA), mA 25 to +60
Mutual conductance (at anode voltage 750 V, grid 2 voltage 375 V, anode current 2000 mA), mA/ V 4472
Output power under conditions of class AB, at frequencies 0.11 MHz (at anode voltage 2000 V, grid 2 voltage 375 V, grid 2 current at least 80 mA, absolute value), kW, at least 1.5
Output power under conditions of class B at frequency 250 MHz (at anode voltage 2000 V, grid 2 voltage 375 V,
anode current 1500 mA, grid 2 current at least 60mA,
grid 1 current at most 4mA), kW, at most 1.2
Interelectrode capacitance, pF: input 90115 output 1823 transfer, at most 0.2
Limit Operating Values
Heater voltage (AC or DC), V 25.628.4
Anode voltage, kV: DC 2.2KV min to 4.2 KVmax A good working voltage for this tube is 3000v to 4000v
Grid 2 voltage (DC) V 400
Negative grid 1 voltage (DC), absolute value, V 150
Input voltage (amplitude value), V 150
Cathodeheater voltage (either polarity, absolute value), V 100
Cathode current, A: DC
component 2 instantaneous value 6

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