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Voltage Pentode ·Pentode

C243N

Low-voltage directly heated power pentode for battery-operated radio and audio output service, using a 2 V, 200 mA filament.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
-
Socket code
-
Base pins
-
Nominal heater
2 V / 200 mA

Description

C243N is listed in the supplied valve table as a power 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
2 V
Nominal heater current
200 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
75000 Ω
Transconductance
0.0024 S
Amplification factor
180

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

    150 V

    Published table operating point

  • Plate current

    9.5 mA

    Published table operating point

  • Control-grid bias

    4.5 V

    Published table operating point

  • Screen voltage

    150 V

    Published table operating point

  • Optimum load resistance

    15000 ohm

    Published table operating point

  • Power output

    1.5 W

    Published table operating point

Characteristic

  • Transconductance

    2400000 µS

    Published table characteristic

  • Plate resistance

    75000 ohm

    Published table characteristic

  • Heater/filament voltage

    2 V

    Published heater/filament rating

  • Heater/filament current

    200 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

    150 V

    Published datasheet value

  • Screen-grid voltage

    150 V

    Published datasheet value

  • Screen-grid current

    2.2 mA

    Published datasheet value

  • Normal anode current

    9.5 mA

    Published datasheet value

  • Grid bias

    -4.5 V

    Published datasheet value

  • Output power at 5% distortion

    0.44 W

    ClassA; Ra=15kΩ; Va=150V

  • Output power at 10% distortion

    0.58 W

    ClassA; Ra=15kΩ; Va=150V

Characteristics

  • Maximum transconductance

    - to 2.5 mA/V

    Published datasheet value

  • Normal transconductance

    2.4 mA/V

    Published datasheet value

  • Internal resistance

    75 kΩ

    Published datasheet value

  • Amplification factor

    180

    Published datasheet value