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Voltage Pentode or Tetrode (under 100V) ·Diode-Pentode

2E41

Ultra-low-power battery diode-pentode combining signal detection with voltage amplification. The diode supplies detector action while the pentode provides subsequent gain from exceptionally economical filament and plate supplies.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
2
Base
2E41
Socket code
-
Base pins
-
Nominal heater
1.25 V / 30 mA

Description

Directly heated diode-pentode for low-voltage battery-operated Class-A amplifier service.

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
2E41
Socket code
-
Base pins
-
Nominal heater voltage
1.25 V
Nominal heater current
30 mA
Parallel heater voltage
-
Parallel heater current
-
Series capable
No

2E41 - Terminal pinout

Electrical assignments shared by every tube using this base designation.

No verified pinout is recorded for this base designation.

Section ratings

2 physical sections, each with unique specifications.

Section 1

Diode

X-ray radiationInterelectrode capacitances

No fixed ratings are recorded for this section.

Promoted from the printed maximum-rating/characteristic columns; additional operating-point and capacitance data are retained in TUBE_SECTION_PARAMETER. The condensed chart identifies a diode section but does not publish separate diode limiting ratings.

Section 2

Pentode

X-ray radiationInterelectrode capacitances
Plate resistance
250000 Ω
Transconductance
0.000375 S
Max plate voltage
45 V
Max screen voltage
45 V

Promoted from the printed maximum-rating/characteristic columns; additional operating-point and capacitance data are retained in TUBE_SECTION_PARAMETER.

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

195X General Electric Essential Characteristics

Published operating points and test conditions from this source.

SECTION 2

Pentode

Capacitance

  • Input capacitance

    2.7 pF

    Section2

  • Output capacitance

    4.3 pF

    Section2

  • Grid-to-plate capacitance

    0.1 pF

    Section2

Other

  • Plate voltage

    22.5 V

    ClassA

  • Screen voltage

    22.5 V

    ClassA

  • Cathode resistor

    5000000 Ω

    ClassA

  • Plate current

    0.35 mA

    ClassA

  • Screen current

    0.12 mA

    ClassA

Characteristic

  • Plate resistance

    250000 Ω

    ClassA

  • Transconductance

    375 µS

    ClassA