Skip to main content
Tube Tinker — Electron Tube Database
Alternatives & variationsDownload PDF datasheet

Power - TV Vertical Output ·Pentode

EL508

High-current frame-output pentode for vertical deflection in color television receivers.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
-
Socket code
B9D
Base pins
9
Nominal heater
6.3 V / 825 mA

Description

Frame-output pentode for vertical deflection in color television receivers.

Socket description

Magnoval 9-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
-
Socket code
B9D
Base pins
9
Nominal heater voltage
6.3 V
Nominal heater current
825 mA
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

Pentode

X-ray radiationInterelectrode capacitances
Transconductance
0.009 S
Max plate voltage
400 V
Max screen voltage
275 V
Max plate dissipation
12 W
Max screen dissipation
3 W
Max cathode current
100 mA

Published ratings and characteristics promoted where clearly stated; identical repeated sections compressed when 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

1972 Philips Receiving Tubes

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristics

  • Heater voltage

    6.3 V

    Published nominal value

  • Heater current

    825 mA

    Published nominal value

  • Transconductance

    90000 µS

    Published or referenced operating characteristic

Other

  • Maximum plate dissipation

    12 W

    Published or referenced maximum rating

Data set 02

1999 Philips E-Z

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

  • Maximum cathode-heater voltage

    100 V