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Rectifier - Half Wave ·Rectifier

4048A

Directly heated oxide-filament half-wave mercury-vapor rectifier for power conversion. Rated for approximately 1.6 kV peak inverse voltage, with published operating conditions covering multi-valve rectifier circuits.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
-
Socket code
B4
Base pins
4
Nominal heater
1.8 V / 5 A

Description

Directly heated oxide-filament mercury-vapour rectifier with 1.6 kV peak inverse rating and published multi-valve rectifier circuit operating conditions.

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
-
Socket code
B4
Base pins
4
Nominal heater voltage
1.8 V
Nominal heater current
5 A
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

Rectifier

X-ray radiationInterelectrode capacitances
Rectifier peak inverse voltage
1600 V
Rectifier peak forward current
750 mA
Rectifier warm-up time
30 s

Published ratings/characteristics promoted; remaining useful source values represented as parameters.

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

1937 Standard Valves

Published operating points and test conditions from this source.

SECTION 1

Rectifier

Other

  • Time delay

    30 s

  • Heating period after transport

    15 min

  • Recommended ambient temperature minimum

    10 degC

  • Recommended ambient temperature maximum

    50 degC

  • Typical load voltage

    500 V

    Circuit2;TwoValves

  • Typical load current

    450 mA

    Circuit2;TwoValves

Data set 02

1946 Standard Telephone and Cables

Published operating points and test conditions from this source.

SECTION 1

Rectifier

Characteristics

  • Heater/filament voltage

    1.8 V

  • Heater/filament current

    5 A

Other

  • Maximum peak inverse voltage

    1600 V

  • Maximum peak anode current

    750 mA