EL509S

High-power output beam pentode explicitly designed for beam-power output service in demanding amplifier applications.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: -
Base pins: 8
Nominal heater: 6.3 V / 2 A

Description

The source identifies this device as EL509S output power beam pentode. It also specifies beam-power output service.

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: -
Base pins: 8
Nominal heater voltage: 6.3 V
Nominal heater current: 2 A
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

Terminal pinout

Electrical assignments shared by every tube using this base designation.

No verified pinout is recorded for this base designation.

Section ratings

1 physical section, each with unique specifications.

Section 1

Beam Power

X-ray radiationInterelectrode capacitances

Max plate voltage: 700 V
Max screen voltage: 700 V
Max screen dissipation: 9 W
Max cathode current: 500 mA
Rectifier max heater-cathode voltage: 150 V

Promoted from published typical characteristics and limiting values in EL509S.pdf; repeated identical physical sections are compressed where applicable.

Source-dependent data

Operating conditions by source

Each block preserves the test conditions and published values from one reference. Values from different sources are intentionally kept separate.

Data set 01

2026 JJ Electronic

Published operating points and test conditions from this source.

SECTION 1

Beam Power

Other

Uf
6.3 V
Published value
If
2 A
Published value
Ua
700 V
Published value
Ug2
700 V
Published value
Wg2
9 W
Published value
Ik
500 mA
Published value
Ukf
150 V
Published value
Wa+g2
42 W
Published value

Characteristics

Ua
160 V
Published value
Ug2
160 V
Published value
Ug1
-30 V
Published value
Ia
200 mA
Published value
Ig2
10 mA
Published value
Usat
30 V
Published value

Capacitance

ca/g1
3 pF
Published value