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Voltage Pentode ·Pentode

B443S

Philips output pentode closely related to B443, providing approximately 3 W plate dissipation for early audio power-amplifier service.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
035
Socket code
-
Base pins
-
Nominal heater
4 V / 150 mA

Description

B443S is listed in the supplied valve table as a pentode. 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
035
Socket code
-
Base pins
-
Nominal heater voltage
4 V
Nominal heater current
150 mA
Parallel heater voltage
-
Parallel heater current
-
Series capable
No

035 - 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
Plate resistance
60000 Ω
Transconductance
0.0016 S
Amplification factor
100
Max plate voltage
250 V
Max screen voltage
80 V
Max plate dissipation
3 W
Max screen dissipation
0.4 W
Max cathode current
15 mA

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

Pentode

Other

  • Plate voltage

    250 V

    Published table operating point

  • Plate current

    12 mA

    Published table operating point

  • Control-grid bias

    12 V

    Published table operating point

  • Screen voltage

    80 V

    Published table operating point

  • Optimum load resistance

    22000 ohm

    Published table operating point

  • Power output

    6.8 W

    Published table operating point

  • Maximum plate dissipation

    3 W

    Published table rating

Characteristic

  • Transconductance

    1600000 µS

    Published table characteristic

  • Plate resistance

    60000 ohm

    Published table characteristic

  • Heater/filament voltage

    4 V

    Published heater/filament rating

  • Heater/filament current

    150 mA

    Published heater/filament rating

Data set 02

1999 Philips 0-D

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

  • Typical anode voltage

    250 V

    Published datasheet value

  • Auxiliary-grid voltage

    80 V

    Published datasheet value

  • Normal anode current

    12 mA

    Published datasheet value

  • Grid bias

    -12 V

    Published datasheet value

  • Output power

    0.86 W

    ClassA; Ra=20kΩ

Characteristics

  • Maximum transconductance

    - to 2 mA/V

    Published datasheet value

  • Normal transconductance

    1.6 mA/V

    Published datasheet value

  • Screen-grid current

    1.9 mA

    Published datasheet value

  • Screen-grid current range

    1.4 to 2.4 mA

    Published datasheet value

  • Maximum grid-circuit resistance

    - to 1.5 MΩ

    Published datasheet value

  • Interelectrode capacitance 1

    1.4 pF

    Published datasheet value

  • Interelectrode capacitance 2

    9.6 pF

    Published datasheet value

  • Interelectrode capacitance 3

    8.9 pF

    Published datasheet value