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Voltage Tetrode ·Tetrode

B442

Philips tetrode documented in valve tables with published operating and characteristic values; available source material does not support a narrower functional category without speculation.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
AS/03S
Socket code
-
Base pins
-
Nominal heater
4 V / 100 mA

Description

B442 is listed in the supplied valve table as a tetrode. Published operating and characteristic values were transcribed from its target row.

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
AS/03S
Socket code
-
Base pins
-
Nominal heater voltage
4 V
Nominal heater current
100 mA
Parallel heater voltage
-
Parallel heater current
-
Series capable
No

AS/03S - 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
0.0009 S
Amplification factor
350

Published operating point, characteristic values and capacitance column 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 1

Tetrode

Other

  • Plate voltage

    200 V

    Published table operating point

  • Plate current

    4.5 mA

    Published table operating point

  • Control-grid bias

    1 V

    Published table operating point

  • Screen voltage

    100 V

    Published table operating point

Characteristic

  • Transconductance

    900 µS

    Published table characteristic

  • Plate resistance

    400000 ohm

    Published table characteristic

  • Heater/filament voltage

    4 V

    Published heater/filament rating

  • Heater/filament current

    100 mA

    Published heater/filament rating

Capacitance

  • Grid-to-plate capacitance

    0.005 pF

    Published table capacitance

Data set 02

1999 Philips 0-D

Published operating points and test conditions from this source.

SECTION 1

Tetrode

Other

  • Anode voltage

    200 V

    Published datasheet value

  • Screen-grid voltage

    100 V

    Published datasheet value

  • Normal anode current

    4.5 mA

    Published datasheet value

  • Grid bias

    -1 V

    Published datasheet value

Characteristics

  • Transconductance

    0.9 mA/V

    Published datasheet value

  • Internal resistance

    400 kΩ

    Published datasheet value

  • Amplification factor

    350

    Published datasheet value

  • Anode-grid capacitance

    0.005 pF

    Published datasheet value