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

Voltage - Triode (with diode, heptode or hexode) ·Diode-Triode

E444S

European binode diode-triode documented in Philips valve tables, providing detector and triode-amplifier functions in a single receiving valve.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
2
Base
-
Socket code
B5
Base pins
5
Nominal heater
4 V / 1 A

Description

E444S is listed in the supplied valve table as a binode diode-triode. Published operating and characteristic values were transcribed from its target row.

Socket description

European 5-pin base

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
-
Socket code
B5
Base pins
5
Nominal heater voltage
4 V
Nominal heater current
1 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

2 physical sections, each with unique specifications.

Section 1

Diode

X-ray radiationInterelectrode capacitances

No fixed ratings are recorded for this section.

Published target-row operating and characteristic values reviewed.

Section 2

Triode

X-ray radiationInterelectrode capacitances
Plate resistance
15000 Ω
Transconductance
0.002 S
Amplification factor
30
Max plate voltage
200 V

Published target-row operating and characteristic values reviewed.

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

1938 Philips Miniwatt Vacuum Tube Catalog

Published operating points and test conditions from this source.

SECTION 2

Triode

Other

  • Plate voltage

    200 V

    Published European table row

  • Plate current

    6 mA

    Published European table row

  • Control-grid bias

    3.5 V

    Published European table row

Characteristic

  • Plate resistance

    15000 ohm

    Published European table row

  • Transconductance

    2000 µS

    Published European table row

  • Heater/filament voltage

    4 V

    Published European table row

  • Heater/filament current

    1 A

    Published European table row

Data set 02

1999 Philips E-Z

Published operating points and test conditions from this source.

SECTION 2

Triode

Characteristics

  • Anode voltage

    200 V

    Published datasheet value