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Power - Pentode Single (NOT beam) (under 10W) ·Pentode

C443

Philips pentode with documented Class-A operating data and published output characteristics. Its manufacturer ratings support low-frequency power-amplifier service rather than ordinary small-signal operation.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
A/O
Socket code
B4
Base pins
4
Nominal heater
4 V / 250 mA

Description

C443 is listed in the supplied valve table as a pentode. Published operating and characteristic values were transcribed from its target row.

Socket description

European 4-pin base

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
A/O
Socket code
B4
Base pins
4
Nominal heater voltage
4 V
Nominal heater current
250 mA
Parallel heater voltage
-
Parallel heater current
-
Series capable
No

A/O - 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
35000 Ω
Transconductance
0.0017 S
Amplification factor
60
Max plate dissipation
6 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

    300 V

    Published table operating point

  • Plate current

    20 mA

    Published table operating point

  • Control-grid bias

    25 V

    Published table operating point

  • Screen voltage

    200 V

    Published table operating point

  • Optimum load resistance

    15000 ohm

    Published table operating point

  • Maximum plate dissipation

    6 W

    Published table rating

Characteristic

  • Transconductance

    1700000 µS

    Published table characteristic

  • Plate resistance

    35000 ohm

    Published table characteristic

  • Heater/filament voltage

    4 V

    Published heater/filament rating

  • Heater/filament current

    250 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

    300 V

    Published datasheet value

  • Anode current

    20 mA

    Published datasheet value

  • Grid No.1 voltage

    -25 V

    Published datasheet value

  • Grid No.2 voltage

    200 V

    Published datasheet value

  • Grid No.2 current

    4.5 mA

    Published datasheet value

  • Cathode resistor

    1000 Ω

    ClassA

  • Grid No.2 resistor

    20 kΩ

    ClassA

  • Anode load resistance

    15 kΩ

    ClassA

  • Input voltage

    18 V RMS

    ClassA

  • Output power

    2.8 W

    ClassA; d=10%

Characteristics

  • Transconductance

    1.7 mA/V

    Published datasheet value

  • Internal resistance

    35 kΩ

    Published datasheet value

  • Amplification factor

    60

    Published datasheet value