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Voltage - Triode (single) ·Triode

1LF3

Low-filament-power directly heated medium-mu triode for battery-operated signal amplification and general receiving service.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
4AA
Socket code
-
Base pins
4
Nominal heater
1.4 V / 50 mA

Description

1LF3 is listed as a medium-mu triode in the supplied receiving-tube handbook. It uses a 1.4 V, 0.05 A directly heated filament. The handbook publishes maximum ratings and representative operating characteristics for its intended service.

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
4AA
Socket code
-
Base pins
4
Nominal heater voltage
1.4 V
Nominal heater current
50 mA
Parallel heater voltage
-
Parallel heater current
-
Series capable
No

4AA - 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

Triode

X-ray radiationInterelectrode capacitances
Plate resistance
11200 Ω
Transconductance
0.0013 S
Amplification factor
14.5
Max plate voltage
110 V

Published handbook maximum ratings and representative operating characteristics 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

1950 Sylvania

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

  • Plate Voltage

    90 V

    Grid 0 V

  • Plate Current

    4.5 mA

    Grid 0 V

  • Plate Current

    1.4 mA

    Grid -3 V

Characteristic

  • Plate Resistance

    11200 ohm

    Grid 0 V

  • Transconductance

    1300 µS

    Grid 0 V

  • Amplification Factor

    14.5

    Grid 0 V

  • Plate Resistance

    19000 ohm

    Grid -3 V

  • Transconductance

    760 µS

    Grid -3 V

Data set 02

195X General Electric Essential Characteristics

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

  • Maximum plate voltage

    110 V

    Published handbook rating

  • Plate voltage

    90 V

    ClassA

  • Control-grid voltage

    0 V

    ClassA

  • Plate current

    4.5 mA

    ClassA

Characteristic

  • Plate resistance

    11200 ohm

    Published handbook characteristic

  • Transconductance

    1300 µS

    Published handbook characteristic

  • Amplification factor

    14.5

    Published handbook characteristic

  • Filament voltage

    1.4 V

    DirectlyHeated DC filament

  • Filament current

    50 mA

    DirectlyHeated DC filament