Svetlana EL509 / EL519 / 6KG6

High Performance Beam Power Tetrode

The Svetlana EL509 is a beam power tetrode intended for use in class A, AB or B audio amplifiers and for

class B or C RF amplification. Close manufacturing specification tolerances and improved high voltage

processing provides improved reliability and superior performance.

The Svetlana EL509 features: Increased peak cathode emission from new cathode materials; Stable

operation from extended processing and aging; Gold-plated grid; Precise grid/screen alignment;

Extraheavy glass envelope for ruggedness; Improved vacuum processing; Comprehensive testing before

and after aging.

The Svetlana EL509 is manufactured in Russia at the Svetlana factory and is designed to be a direct

replacement for any 6KG6 or EL509. The strict manufacturing and quality controls at the Svetlana plant

assure functionality and long life.

Electrical

Heater

Min

Nom

Max

Voltage(AC,DC)

5.7

6.3

6.9

V

Current

2.5

A

Transconductance(nominal)

18,000

μS

Plate resistance(nominal)

8,000

Ω

Interelectrode capacitances(typical):

Grid to cathode

25

pF

Grid to plate

2.5

pF

Maximum Ratings

DC plate voltage

900

V

DC plate voltage, pulsed

8,000

V

Grid2(screen) DC voltage

300

V

DC cathode current

500

mA

Plate dissipation

35

W

Grid2 DC screen dissipation

7

W

Typical Operation

Audio Amplifier, Class A1 (single tube)

DC plate voltage

500

V

Grid2(screen) DC voltage

280

V

Grid1(control) voltage

-82

V

Peak grid drive

50

VP-P

Zero signal plate current

70

mA

Max signal plate current

100

mA

Effective load resistance

1,650

Ω

Distortion at 1 watt into 8 ohms

0.9

%

Output power at 5% distortion

14

W

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