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Power - Pentode (NOT beam) ·Pentode

3LE4

Directly heated power pentode for Class-A audio output with series/parallel filaments. Its low-voltage filamentary construction is suited to portable battery-powered audio equipment.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
6BA
Socket code
SUBMINIATURE6
Base pins
6
Nominal heater
1.4 V / 100 mA

Description

Directly heated power pentode for Class A audio output with series/parallel filaments.

Socket description

Subminiature 6-lead base

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
6BA
Socket code
SUBMINIATURE6
Base pins
6
Nominal heater voltage
1.4 V
Nominal heater current
100 mA
Parallel heater voltage
1.4 V
Parallel heater current
100 mA
Series capable
Yes

6BA - 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
Transconductance
0.00175 S
Max plate voltage
110 V
Max screen voltage
110 V
Max cathode current
13 mA

Directly heated power pentode for Class A audio output with series/parallel filaments.

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

1950 Sylvania

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristic

  • Transconductance

    1750 µS

Other

  • Maximum Plate Voltage

    110 V

  • Maximum Screen Voltage

    110 V

  • Maximum Cathode Current

    13 mA

  • Plate Voltage

    90 V

    ClassA

  • Screen Voltage

    90 V

    ClassA

  • Power Output

    325 mW

    ClassA; parallel filament

Data set 02

195X General Electric Essential Characteristics

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

  • Plate voltage

    90 V

    ClassA;ParallelFilaments

  • Screen-grid voltage

    90 V

    ClassA;ParallelFilaments

  • Grid No.1 bias

    9 V

    ClassA;ParallelFilaments

  • Plate current

    10 mA

    ClassA;ParallelFilaments

  • Screen-grid current

    2 mA

    ClassA;ParallelFilaments

  • Plate resistance

    100000 ohm

    ClassA;ParallelFilaments

  • Transconductance

    1700 uS

    ClassA;ParallelFilaments

  • Load resistance

    6000 ohm

    ClassA;ParallelFilaments

  • Power output

    0.325 W

    ClassA;ParallelFilaments

  • Plate voltage

    90 V

    ClassA;SeriesFilaments

  • Screen-grid voltage

    90 V

    ClassA;SeriesFilaments

  • Grid No.1 bias

    9 V

    ClassA;SeriesFilaments

  • Plate current

    8.8 mA

    ClassA;SeriesFilaments

  • Screen-grid current

    1.8 mA

    ClassA;SeriesFilaments

  • Plate resistance

    110000 ohm

    ClassA;SeriesFilaments

  • Transconductance

    1600 uS

    ClassA;SeriesFilaments

  • Load resistance

    6000 ohm

    ClassA;SeriesFilaments

  • Power output

    0.3 W

    ClassA;SeriesFilaments