GU-84B 
POWER TRANSMITTING TETRODE

     The GU-84B is a ceramic-metal forced-air cooled tetrode intended for use in power  amplifiers with distributed amplification and for SSB-signal amplification with output power up to 1.5 kW at frequencies up to 75 MHz as well as for power amplification at frequencies up to 250 MHz. with output power up to 1.2 kW in mobile radiotechnical equipment.

CHARACTERISTICS

Anode Dissipation (PD) 2.5 kW
Screen Dissipation (Pg2) 30 W
Grid Dissipation (Pg1) 1 W
Frequency for Max. Ratings (f) 250 MHz
Cathode Oxide coated
Heater voltage (UF) 27 V
Heater current (IF) 3.7A
Transconductance at Ua= 1.5 kV; 
Ug2 = 375 V; Ia = 2 A 		70 mA/V

Capacitances (ground cathode connection)
     Input, (C1)
     Output, (C2)
     Feed-through, (Cag1)


<115 pF
<23 pF
<0.2 pF
Max. Seal and Envelope Temperature 200° C
Maximum Length 115 mm
Maximum Diameter 99 mm
Weight (approximate) 1.5 k g
Operating Position Any
Blower 250 m3/h

 

Class of
Operation 		Type of Service Max. Ratings Typical Operation
Anode
Voltage,
kV 		Screen
Voltage,
V 		Cathode
Current,
mA 		Anode
Voltage,
kV 		Screen
Voltage,
V 		Anode
Current,
A 		Output
Power
kW
AB1 RF Linear Amplifier at
75 MHz 		2.2 400 2 2 375 1.25 1.5

Intermodulation distortion of the 3rd order - minus 35 dB

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