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

Rectifier - Full Wave ·Rectifier-Rectifier

U709

Half-wave rectifier for electronic power-supply service, with manufacturer documentation defining its voltage, current, and intended operating conditions.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
2
Base
-
Socket code
B9A
Base pins
-
Nominal heater
6.3 V / 950 mA

Description

The Marconi U709 is a miniature indirectly heated bi-phase half-wave rectifier.

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
-
Nominal heater voltage
6.3 V
Nominal heater current
950 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

2 physical sections, each with unique specifications.

Section 1

Rectifier

X-ray radiationInterelectrode capacitances
Rectifier peak inverse voltage
1000 V
Rectifier nominal output current
150 mA
Rectifier peak forward current
450 mA
Rectifier max heater-cathode voltage
450 V

Section 2

Rectifier

X-ray radiationInterelectrode capacitances
Rectifier peak inverse voltage
1000 V
Rectifier nominal output current
150 mA
Rectifier peak forward current
450 mA
Rectifier max heater-cathode voltage
450 V

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

1955 Marconi

Published operating points and test conditions from this source.

SECTION 1

Rectifier

Other

  • Heater/filament voltage

    6.3 V

  • Heater/filament current

    950 mA

  • Peak inverse voltage

    1000 V

  • Nominal/maximum output current

    150 mA

  • Peak anode current

    450 mA

  • Maximum heater-cathode voltage

    450 V

  • Surge anode current

    1.5 A

  • Typical output voltage

    340 V

    CapacitorInput

Construction

  • Rectifier topology

    Bi-phase/full-wave