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

Rectifier - Half Wave ·Rectifier

31A3

Directly heated half-wave rectifier for AC-to-DC power conversion, using a 31 V filament suitable for series-heater equipment and providing approximately 100 mA output.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
8HB
Socket code
-
Base pins
-
Nominal heater
31 V / 100 mA

Description

31A3 is a rectifier tube for ac-to-dc conversion. The supplied Philips datasheet was read for construction, ratings, characteristics, operating data, and stated applications.

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
8HB
Socket code
-
Base pins
-
Nominal heater voltage
31 V
Nominal heater current
100 mA
Parallel heater voltage
-
Parallel heater current
-
Series capable
No

8HB - 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

Rectifier

X-ray radiationInterelectrode capacitances
Rectifier nominal output current
100 mA
Rectifier max heater-cathode voltage
550 V

Published ratings/characteristics are additionally preserved in TUBE_SECTION_PARAMETER.

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

1999 Philips 0-D

Published operating points and test conditions from this source.

SECTION 1

Rectifier

Characteristic

  • Pin

    7 C

    Pin 7 Cathode

  • Heater Voltage

    31 V

    Heater Voltage 31 volts

  • Heater Current

    100 mA

    Heater Current 0.1 amps

  • A.C. Plate Supply Voltage (RMS)

    250 V

    A.C. Plate Supply Voltage (RMS) 250 volts

  • b.C. Output current

    100 mA

    b.C. Output current 100 ma

  • Filter input capacltor

    50 pF

    Filter input capacltor 50 pF

  • Effective Plate Supply Impedance

    210 ohms

    Effective Plate Supply Impedance 210 ohms

  • cathode

    550 V

    cathode 550 volts