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

1L34

Tesla directly heated battery output pentode producing about 230 mW Class-A audio power with an economical 1.2 V filament.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
-
Socket code
B7G
Base pins
7
Nominal heater
1.2 V / 60 mA

Description

Directly heated output pentode for audio power amplification.

Socket description

Miniature 7-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
-
Socket code
B7G
Base pins
7
Nominal heater voltage
1.2 V
Nominal heater current
60 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
Transconductance
0.0014 S
Max plate voltage
90 V
Max screen voltage
67.5 V
Max plate dissipation
0.7 W
Max screen dissipation
0.2 W
Max cathode current
12 mA

Published ratings and characteristics promoted from the source where directly stated.

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 Tesla

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristics

  • Heater or filament voltage

    1.2 V

    Published nominal value

  • Heater or filament current

    60 mA

    Published nominal value

  • Transconductance

    1.4 mA/V

    Typical value

Other

  • Output power

    230 mW

    ClassA; 90 V plate operation

Data set 02

1969 Tesla Manual of Electronic Tubes

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

  • Power Output

    230 mW

    ClassA;OneTube