Skip to main content
Tube Tinker — Electron Tube Database
Alternatives & variationsDownload PDF datasheet

Voltage Pentode - High Frequency (single) ·Pentode

R142

Long-life professional pentode designed for voltage amplification, with high-frequency or wideband service where specified by the manufacturer.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
-
Socket code
B9A
Base pins
9
Nominal heater
6.3 V / 300 mA

Description

Long-life high-transconductance voltage-amplifier pentode for high-frequency service.

Socket description

Small-button Noval 9-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
-
Socket code
B9A
Base pins
9
Nominal heater voltage
6.3 V
Nominal heater current
300 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
Plate resistance
500000 Ω
Transconductance
0.0085 S
Max plate voltage
225 V
Max screen voltage
225 V
Max plate dissipation
2.6 W
Max screen dissipation
0.6 W

Published ratings and characteristics promoted from the approved 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

1953 La Radiotechnique

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

  • HeaterVoltageNominal

    6.3 V

    Nominal

  • HeaterCurrentNominal

    300 mA

    Nominal

  • Maximum Plate Voltage

    225 V

  • Maximum Screen Voltage

    225 V

  • Maximum Plate Dissipation

    2.6 W

  • Maximum Screen Dissipation

    0.6 W

Characteristic

  • Transconductance

    8500 µS

    Typical

  • Amplification Factor

    4250

    Typical

  • Plate Resistance

    500000 ohm

    Typical