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 GU-43B 
 POWER TRANSMITTING TETRODE
 
The GU-43B tetrode is used for continuous operation at frequencies up to 100 MHz in 
separately-or self-excited oscillator circuits and as linear power amplifiers in RF equipment. 
GENERAL Cathode: indirectly heated, oxide-coated. 
Envelope: glass-to-metal

CHARACTERISTICS

Anode Dissipation ....................... 1 kW
Screen Dissipation ....................... 28 W
Grid Dissipation ........................... 5 W
Frequency for Max. Ratings ......... 100 MHz
Cathode ...................................... Oxide coated
Heater voltage ............................. 12.6 V
Heater current ............................. 6.6A
Transconductance at Ua= 1 kV; 
Ug2 = 350 V; Ia = 1 A ...............
45 mA/V

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


<90 pF
<14 pF
<0.1 pF
Max. Seal and Envelope 
Temperature ...............................
150° C
Maximum Length ......................... 125 mm
Maximum Diameter ..................... 100 mm
Weight (approximate) .................. 1.5 k g
Operating Position ....................... Any
Blower ........................................ 100 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		 3.3 500 1 3 350 0.7 1.0

Intermodulation distortion of the 3rd order is not worse than - minus 21 dB
 

CALCULATION OF MAXIMUM  TUBE PARAMETERS
FOR CATHODE DRIVEN AMPLIFIER

_________________________________________________________________

RF LINEAR AMPLIFIER USING GU-43B TETRODE

by "RF Amplifier Developer 2001"
_________________________________________________________________

Plate supply voltage DC (V):................................3300

Screen supply voltage (V):..................................375

Single-tone plate current (A):..............................0.9

Zero-signal plate current (A):..............................0.05
_________________________________________________________________

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

Anode current, pk.,(A):.....................................2.695

Anode current of the first harmonic, pk.,(A):...............1.377

Amplification of the valve under minimal residual voltege:..7.187

AC voltage factor of the valve anode:.......................0.886

Amplitude of RF AC voltage generated

on the valve anode,(V):.....................................2923.8

Minimum residual voltage of the valve anode,(V):............376.2

Peak voltage of the anode, max.,(V):........................6223.8

Maximum produced CW power on the valve anode,(W):...........2013

Maximum produced SSB peak power on the valve anode,(W):.....3079.8

Maximum produced SSB PEP power on the valve anode,(W):......4026.1

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

Average produced power of the valve anode

for SSB signal,(W):.........................................246.592

Maximum input power to the valve anode,(W):.................2970

Maximum efficiency of the valve:............................0.678

Average efficiency of the valve for SSB signal:.............0.229

Average input power to the valve anode,(W):.................1076.821

Valve anode dissipation, max.,(W):..........................957

Average valve anode dissipation,(W):........................830.2

Anode dissipation under zero-signal plate current,(W):......165

Virtual resistance of the valve anode circuit,(ohm):........2123

_________________________________________________________________

PARAMETERS FOR THE 2 HARMONIC
_________________________________________________________________

Anode current of the 2 harmonic, pk.,(A):...................0.52

Maximum produced power for 2 harmonic,(W):..................760.188

Virtual anode resistance for 2 harmonic,(ohm):..............5623

_________________________________________________________________

PARAMETERS FOR THE 3 HARMONIC
_________________________________________________________________

Anode current of the 3 harmonic, pk.,(A):...................0.068

Maximum produced power for 3 harmonic,(W):..................99.409

Virtual anode resistance for 3 harmonic,(ohm):..............42997

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