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Voltage Pentode or Tetrode (under 100V) ·Diode-Tetrode

E444

Early Philips binode combining diode detection with high-gain tetrode amplification for radio receiver signal processing, using a 4 V heater characteristic of prewar European equipment.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
2
Base
-
Socket code
B5
Base pins
-
Nominal heater
4 V / 1.1 A

Description

E444 is listed in the supplied valve table as a binode diode-tetrode. 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
-
Nominal heater voltage
4 V
Nominal heater current
1.1 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

Tetrode

X-ray radiationInterelectrode capacitances
Plate resistance
1000 Ω
Transconductance
0.003 S
Amplification factor
1000
Max plate voltage
20 V
Max screen voltage
45 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

Tetrode

Other

  • Plate voltage

    200 V

    Published European table row

Characteristic

  • Plate resistance

    1000 ohm

    Published European table row

  • Heater/filament voltage

    4 V

    Published European table row

  • Heater/filament current

    1.1 A

    Published European table row

Data set 02

1999 Philips E-Z

Published operating points and test conditions from this source.

SECTION 2

Tetrode

Characteristics

  • Anode voltage

    200 V

    Published datasheet value

  • Screen-grid voltage

    150 V

    Published datasheet value