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

Rectifier - Full Wave ·Rectifier-Rectifier

FW4800

Directly heated full-wave power rectifier for higher-voltage DC supplies. Its four-volt filament and substantial inverse-voltage capability suit amplifier and other high-voltage electronic power supplies.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
2
Base
British4Pin
Socket code
B4
Base pins
4
Nominal heater
4 V / 3 A

Description

Directly heated full-wave power rectifier for outputs up to 800 V at 125 mA.

Socket description

European 4-pin base

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
British4Pin
Socket code
B4
Base pins
4
Nominal heater voltage
4 V
Nominal heater current
3 A
Parallel heater voltage
-
Parallel heater current
-
Series capable
No

British4Pin - 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
Max cathode current
125 mA
Rectifier nominal output current
125 mA

Full-wave directly heated rectifier; RMS anode voltage retained as parameter.

Section 2

Rectifier

X-ray radiationInterelectrode capacitances
Max cathode current
125 mA
Rectifier nominal output current
125 mA

Physical rectifier section 2; identical section values duplicated per physical-section policy.

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

1958 Mullard Receiving Tubes

Published operating points and test conditions from this source.

SECTION 1

Rectifier

Other

  • RMS anode voltage

    850 V

    PerAnode;2x850V

  • Reservoir capacitance maximum

    4 uF

  • Minimum series resistance per anode

    150 Ohm

Data set 02

1963 Mullard

Published operating points and test conditions from this source.

SECTION 1

Rectifier

Characteristic

  • HeaterOrFilamentVoltage

    4 V

  • HeaterOrFilamentCurrent

    3 A

Other

  • RMSInputVoltagePerAnodeMaximum

    850 V

  • DCOutputCurrentMaximum

    125 mA

  • ReservoirCapacitanceMaximum

    4 uF

  • SeriesResistancePerAnodeMinimum

    150 ohm