SV-001
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TV AMPLIFIER ON BASE OF ELECTRON TRANSIT- BEAM POWER PENTODE

GS-47B (SVETRODE SV-001)

 

The amplifier intended for use in IV-V band TV transmitters. The amplifier is designed on the base of GS-47B (Svetrode 001).

GS-47B (Svetrode SV-001) is an electron transit-beam power pentode with axial electron beam.

Electron transit-beam pentode differs from the IOT by lack of the magnetic field owing to special configuration of electrodes that focus the beam by means of electrostatic and RF fields, «short» electronics and multiple-beam design. These features also provide lower accelerating voltage that does not exceed 12 kV for peak sync output power over 13 kW.

 

General Characteristics

 

  • Frequency range for single tube and circuit 470-790 MHz;

  • Multiple-beam tube design;

  • Matrix-oxide cathode, molybdenum grid with gold coating;

  • Low accelerating voltage;

  • Lack of the focusing magnetic field;

  • Small weight and dimensions of amplifier;

  • Simplicity of turning;

  • Air cooling;

  • Simplicity of tube’s replacement.

 

Technical Characteristics

 

Heater voltage, V 5,5¸6,3

Heater current at 6,3 V, A 25,5

Amplification factor, dB 17¸18

Frequency of operation, MHz 470¸790

Sync output power in visual service, kW 10

Voltage of magnetic ion pump power supplier, kV 2,8¸3,4

Maximum current of magnetic ion pump, mA 10

Maximum dimensions of tube:

Height, mm 395

Diameter, mm 200

Maximum dimensions of amplifier (without projecting handles)

Width, mm 460

Depth, mm 450

Height, mm 900

Maximum net weight of tube, kg 15

Maximum net weight of amplifier, kg 70

Input and output wave impedance of amplifier, Ohm 50 ; 75

Cooling forced air

Maximum envelope temperature, C 175°

 

Cooling Data

 

Total air flow rate, cubic meters/hour 1500

Pressure drop, mm of water 200

 

Maximum Ratings

 

DC Beam voltage, kV 12

DC Beam current (CW), A 1,7

DC Grid current, A 0,2

Tube collector dissipation, kW 11

Anode 2 (precollector) dissipation, kW 1,0

Anode 1 dissipation, W 250

TYPICAL OPERATION

UHF TV Amplifier (IV-V Bands)

Visual Signal Amplifier

 

DC Beam voltage, kV

10,5

DC Beam current (sync level), A

2,4

DC Beam current (black level), A

1,55

DC Beam current (grey level), A

1,1

Input power (sync level), W

240

Output power (sync level), kW

Quiescent current, A

11

0,15-0,25

Grid-to-cathode voltage, negative, V

15-25

Conversion efficiency, %

50

FOM, %

95