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Voltage Pentode ·Pentode

B443

Early Philips power pentode for output-amplifier service, combining approximately 3 W plate dissipation with a low-current 4 V heater.

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

Description

B443 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
-
Socket code
-
Base pins
-
Nominal heater voltage
4 V
Nominal heater current
150 mA
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

Pentode

X-ray radiationInterelectrode capacitances
Plate resistance
55500 Ω
Transconductance
0.0018 S
Amplification factor
100
Max plate dissipation
3 W

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

    19 V

    Published table operating point

  • Screen voltage

    150 V

    Published table operating point

  • Optimum load resistance

    20000 ohm

    Published table operating point

  • Power output

    12.1 W

    Published table operating point

  • Maximum plate dissipation

    3 W

    Published table rating

Characteristic

  • Transconductance

    1350000 µS

    Published table characteristic

  • Plate resistance

    45000 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

  • Anode voltage range

    50 to 150 V

    Published datasheet value

  • Auxiliary/screen-grid voltage range

    50 to 150 V

    Published datasheet value

  • Normal anode current

    12 mA

    Published datasheet value

  • Grid bias

    -15 V

    Published datasheet value

Characteristics

  • Saturation current

    50 mA

    Published datasheet value

  • Transconductance

    1.8 mA/V

    Published datasheet value

  • Internal resistance

    55.5 kΩ

    Published datasheet value

  • Amplification factor

    100

    Published datasheet value