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Voltage Pentode or Tetrode (under 100V) ·Pentode

1J42A

Very-low-consumption Soviet multi-control pentode for RF amplification, oscillation, and frequency conversion. Two control grids support mixer and oscillator functions while an exceptionally economical filament suits battery-powered equipment.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
-
Socket code
-
Base pins
-
Nominal heater
1.2 V / 15 mA

Description

Directly heated pentode with two control grids for RF amplification, oscillation and frequency conversion.

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
1.2 V
Nominal heater current
15 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
Max plate voltage
20 V
Max screen voltage
12 V
Max cathode current
1.3 mA

Values promoted where clearly identifiable from Russian source.

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

1981 Russian Tubes Katsnelson and Larionov

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristic

  • Plate current

    8

    Published Russian-source value; OCR-normalized.

  • Screen current

    0.25 mA

    Published Russian-source value; OCR-normalized.

  • Output capacitance

    3.5 pF

    Published Russian-source value; OCR-normalized.

  • Transfer capacitance

    0.035 pF

    Published Russian-source value; OCR-normalized.

  • Service life

    2000 h

    Published Russian-source value; OCR-normalized.

  • Transconductance

    1

    Published Russian-source value; OCR-normalized.

  • Heater current

    1.5 mA

    Nominal/published heater value.