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GS-36B/4CX400
POWER TRANSMITTING TETRODE


The GS-36B / 4CX400 is a ceramic-metal forced-air cooled tetrode intended for use in amplifier with distributed amplification and SSB-signal amplifiers at frequencies up to 75 MHz as well as for power amplification at  frequencies up to 500 MHz in mobile radiotechnical equipments. The tube is effectively used at low anode voltage (1 - 2 kV) with high efficiency (>50%)

CHARACTERISTICS

Anode Dissipation ....................... 400 W
Screen Dissipation ...................... 8 W
Grid Dissipation .......................... 0.2 W
Frequency for Max. Ratings ........ 500 MHz
Cathode....................................... Oxide coated
Heater Voltage ............................ 6.3 V
Heater current ............................. 3.2A
Transconductance at Ua = 1 kV; Ug2 = 300 V; Ia = 600 mA................. 26 mA/V

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


24 pF
7 pF
<0.08 pF
Max. Seal and Envelope 
Temperature ...............................
200° C
Maximum Length ........................ 67 mm
Maximum Diameter .................... 51.6 mm
Weight (approximate) ................ 220 g
Operating Position ..................... Any
Blower ...................................... 25 m3/h
   

 

 

 

 

Class of
Operation 		Type of Service Max. Ratings Typical Operation (grid-driven)
Anode
Voltage,
kV 		Cathode
Current,
mA 		Anode
Voltage,
kV 		Screen
Voltage,
V 		Anode
Current,
mA 		Output
Power
W
AB1 RF Linear Amplifier at
75 MHz 		2.1 400 2 325 230 250
B RF Linear Amplifier at
500 MHz 		2.1 400 2 325 225 150

Intermodulation distortion of the 3rd order - minus 30 dB
 

CALCULATION OF MAXIMUM TUBE PARAMETERS
FOR GRID DRIVEN AMPLIFIER

_________________________________________________________________

RF LINEAR AMPLIFIER USING GS-36B TETRODE
by "RF Amplifier Developer 2001"
_________________________________________________________________

Plate supply voltage DC (V):................................2200

Screen supply voltage (V):..................................350

Single-tone plate current (A):..............................0.4

Zero-signal plate current (A):..............................0.025
_________________________________________________________________

Anode current conduction angle,(deg):.......................95.6

Anode current, pk.,(A):.....................................1.191

Anode current of the first harmonic, pk.,(A):...............0.61

Amplification of the valve under minimal residual voltege:..3.403

AC voltage factor of the valve anode:.......................0.841

Amplitude of RF AC voltage generated

on the valve anode,(V):.....................................1850.2

Minimum residual voltage of the valve anode,(V):............349.8

Peak voltage of the anode, max.,(V):........................4050.2

Maximum produced CW power on the valve anode,(W):...........564.3

Maximum produced SSB peak power on the valve anode,(W):.....860.4

Maximum produced SSB PEP power on the valve anode,(W):......1128.6

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

Average produced power of the valve anode

for SSB signal,(W):.........................................69.127

Maximum input power to the valve anode,(W):.................880

Maximum efficiency of the valve:............................0.641

Average efficiency of the valve for SSB signal:.............0.216

Average input power to the valve anode,(W):.................320.032

Valve anode dissipation, max.,(W):..........................315.7

Average valve anode dissipation,(W):........................250.9

Anode dissipation under zero-signal plate current,(W):......55

Virtual resistance of the valve anode circuit,(ohm):........3033

_________________________________________________________________

PARAMETERS FOR THE 2 HARMONIC
_________________________________________________________________

Anode current of the 2 harmonic, pk.,(A):...................0.227

Maximum produced power for 2 harmonic,(W):..................209.998

Virtual anode resistance for 2 harmonic,(ohm):..............8151

_________________________________________________________________

PARAMETERS FOR THE 3 HARMONIC

_________________________________________________________________

Anode current of the 3 harmonic, pk.,(A):...................0.033

Maximum produced power for 3 harmonic,(W):..................30.528

Virtual anode resistance for 3 harmonic,(ohm):..............56067


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