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Voltage Tetrode ·Tetrode

E442S

Philips indirectly heated tetrode for receiving equipment. Available source material confirms conventional tetrode operation but does not establish a narrower functional category.

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

Description

E442S is a Tetrode device in the supplied Philips literature. Philips indirectly heated tetrode amplifier variant with reduced screen voltage.

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

1 physical section, each with unique specifications.

Section 1

Tetrode

X-ray radiationInterelectrode capacitances
Plate resistance
400000 Ω
Transconductance
0.0011 S
Amplification factor
400
Max plate voltage
200 V
Max screen voltage
60 V

Philips indirectly heated tetrode amplifier variant with reduced screen voltage.

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 1

Tetrode

Other

  • Plate voltage

    200 V

    ClassA

  • Plate current

    4 mA

    ClassA

  • Grid bias

    -2 V

    ClassA

  • Screen voltage

    60 V

    ClassA

  • Screen current

    0.5 mA

    ClassA

Characteristic

  • Transconductance

    1.1 mA/V

    ClassA

  • Amplification factor

    400

    ClassA

  • Internal resistance

    400000 ohm

    ClassA

Capacitance

  • Grid-to-plate capacitance

    0.02 pF

Data set 02

1999 Philips E-Z

Published operating points and test conditions from this source.

SECTION 1

Tetrode

Other

  • Normal plate current

    4 mA

  • Grid bias

    -2 V

Characteristic

  • Maximum transconductance

    1100 µS

  • Anode-grid capacitance

    0.02 pF