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GU-84B/4CX2500A 
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 ...................

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. ..........


70 mA/V

Capacitance
     Input ..................................
     Output ...............................
     Feed-through .....................


<115 pF
<23 pF
<0.2 pF

Max. Seal and Envelope 
Temperature ...........................


200° C

Maximum Length ....................

115 mm

Maximum Diameter .................

99 mm

Weight (approximate) ..............

1.75 k g

Operating Position ...................

Any

Blower ....................................

250 m3/h

Class of
Operation

Type of Service

Max. Ratings

Typical Operation (grid-driven)

Anode
Voltage,
kV

Screen
Voltage,
V

Cathode
Current,
A

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

OPERATING ENVIRONMENTAL CONDITIONS
Vibration loads: frequencies, Hz 1-80
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%

 

CALCULATION OF MAXIMUM  TUBE PARAMETERS
FOR CATHODE DRIVEN AMPLIFIER

_________________________________________________________________

RF LINEAR AMPLIFIER USING GU-84B TETRODE

by "RF Amplifier Developer 2001" Version 1.5
_________________________________________________________________

Plate supply voltage DC (V):................................2600

Screen supply voltage (V):..................................400

Single-tone plate current (A):..............................1.8

Zero-signal plate current (A):..............................0.1

_________________________________________________________________

Anode current conduction angle,(deg):.......................94.97

Anode current, pk.,(A):.....................................5.391

Anode current of the first harmonic, pk.,(A):...............2.754

Amplification of the valve under minimal residual voltege:..13.478

AC voltage factor of the valve anode:.......................0.846

Amplitude of RF AC voltage generated

on the valve anode,(V):.....................................2199.6

Minimum residual voltage of the valve anode,(V):............400.4

Peak voltage of the anode, max.,(V):........................4799.6

Maximum produced CW power on the valve anode,(W):...........3028.8

Maximum produced SSB peak power on the valve anode,(W):.....4633.9

Maximum produced SSB PEP power on the valve anode,(W):......6057.7

Factor for SSB signal, under peak-factor,(p=4):.............0.35

Average produced power of the valve anode

for SSB signal,(W):.........................................371.028

Maximum input power to the valve anode,(W):.................4680

Maximum efficiency of the valve:............................0.647

Average efficiency of the valve for SSB signal:.............0.219

Average input power to the valve anode,(W):.................1694.192

Valve anode dissipation, max.,(W):..........................1651.2

Average valve anode dissipation,(W):........................1323.2

Anode dissipation under zero-signal plate current,(W):......260

Virtual resistance of the valve anode circuit,(ohm):........799

_________________________________________________________________

PARAMETERS FOR THE 2 HARMONIC
_________________________________________________________________

Anode current of the 2 harmonic, pk.,(A):...................1.041

Maximum produced power for 2 harmonic,(W):..................1144.892

Virtual anode resistance for 2 harmonic,(ohm):..............2113

_________________________________________________________________

PARAMETERS FOR THE 3 HARMONIC
_________________________________________________________________

Anode current of the 3 harmonic, pk.,(A):...................0.135

Maximum produced power for 3 harmonic,(W):..................148.473

Virtual anode resistance for 3 harmonic,(ohm):..............16293

 

CALCULATION OF MAXIMUM TUBE PARAMETERS
FOR GRID DRIVEN AMPLIFIER

_________________________________________________________________

RF LINEAR AMPLIFIER USING GU-84B TETRODE

by "RF Amplifier Developer 2001" Version 1.5
_________________________________________________________________

Plate supply voltage DC (V):................................2500

Screen supply voltage (V):..................................400

Single-tone plate current (A):..............................1.9

Zero-signal plate current (A):..............................0.5

_________________________________________________________________

Anode current conduction angle,(deg):.......................114.8

Anode current, pk.,(A):.....................................4.847

Anode current of the first harmonic, pk.,(A):...............2.592

Amplification of the valve under minimal residual voltege:..12.118

AC voltage factor of the valve anode:.......................0.84

Amplitude of RF AC voltage generated

on the valve anode,(V):.....................................2100

Minimum residual voltage of the valve anode,(V):............400

Peak voltage of the anode, max.,(V):........................4600

Maximum produced CW power on the valve anode,(W):...........2721.6

Maximum produced SSB peak power on the valve anode,(W):.....3712

Maximum produced SSB PEP power on the valve anode,(W):......5443.2

Factor for SSB signal, under peak-factor,(p=4):.............0.35

Average produced power of the valve anode

for SSB signal,(W):.........................................333.396

Maximum input power to the valve anode,(W):.................4750

Maximum efficiency of the valve:............................0.573

Average efficiency of the valve for SSB signal:.............0.166

Average input power to the valve anode,(W):.................2008.41

Valve anode dissipation, max.,(W):..........................2028.4

Average valve anode dissipation,(W):........................1675

Anode dissipation under zero-signal plate current,(W):......1250

Virtual resistance of the valve anode circuit,(ohm):........810

_________________________________________________________________

PARAMETERS FOR THE 2 HARMONIC
_________________________________________________________________

Anode current of the 2 harmonic, pk.,(A):...................0.542

Maximum produced power for 2 harmonic,(W):..................569.1

Virtual anode resistance for 2 harmonic,(ohm):..............3875

_________________________________________________________________

PARAMETERS FOR THE 3 HARMONIC
_________________________________________________________________

Anode current of the 3 harmonic, pk.,(A):...................0.341

Maximum produced power for 3 harmonic,(W):..................358.05

Virtual anode resistance for 3 harmonic,(ohm):..............6158


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