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Rectifier - Full Wave ·Rectifier-Rectifier

28Z5

Double-diode full-wave rectifier for AC power supplies. Its 28 V heater construction provides approximately 1.25 kV peak inverse-voltage capability, 100 mA DC output, and 300 mA peak-current capability.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 2
Base: 5AB
Socket code: B8G
Base pins: 8
Nominal heater: 28 V / 240 mA

Description

Full-wave rectifier tube with two diode sections.

Socket description

Loctal 8-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: 5AB
Socket code: B8G
Base pins: 8
Nominal heater voltage: 28 V
Nominal heater current: 240 mA
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

5AB - 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

Plate resistance: 15 Ω
Rectifier peak inverse voltage: 1250 V
Rectifier nominal output current: 100 mA
Rectifier peak forward current: 300 mA
Rectifier forward voltage drop: 40 V

Published maximum ratings, representative operating conditions, rectifier service data, and capacitance columns reviewed.

Section 2

Rectifier

X-ray radiationInterelectrode capacitances

Plate resistance: 15 Ω
Rectifier peak inverse voltage: 1250 V
Rectifier nominal output current: 100 mA
Rectifier peak forward current: 300 mA
Rectifier forward voltage drop: 40 V

Second physical rectifier section; electrical properties populated from the documented identical section.

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

1950 Sylvania

Published operating points and test conditions from this source.

SECTION 1

Rectifier

Characteristic

Heater Voltage 28.0 Volts
28 V
Heater Voltage 28.0 Volts
Heater Current 0.240 Ampers
240 mA
Heater Current 0.240 Ampers
Faximum Steady-State Pesk Plate Current Per Plate 300 Ma.
300 Ma
Faximum Steady-State Pesk Plate Current Per Plate 300 Ma.
Tube Voltage Drop: Measured with applied DC at 40 Volts
40 V
Tube Voltage Drop: Measured with applied DC at 40 Volts
Beater Voltage 28.0 Volts
28 V
Beater Voltage 28.0 Volts
DC Output Current 100 Ma.
100 Ma
DC Output Current 100 Ma.
Heater Voltage 28.0 Volts
28 V
Heater Voltage 28.0 Volts
AC Plate Voltage per 2late (RMS) 450 Volts
450 V
AC Plate Voltage per 2late (RMS) 450 Volts
DC Output Current 100 Ma,
100 Ma
DC Output Current 100 Ma,

Other

Maximum AC Plate Voltage (RMS) Condenser Input 325 Volts
325 V
Maximum AC Plate Voltage (RMS) Condenser Input 325 Volts

SECTION 2

Rectifier

Characteristic

Heater Voltage 28.0 Volts
28 V
Heater Voltage 28.0 Volts
Heater Current 0.240 Ampers
240 mA
Heater Current 0.240 Ampers

Data set 02

195X General Electric Essential Characteristics

Published operating points and test conditions from this source.

SECTION 1

Rectifier

Characteristic

Heater/filament voltage
28 V
Published heater/filament rating
Heater/filament current
240 mA
Published heater/filament rating
Tube voltage drop
40 V
At 100 mA DC

Other

DC output current
100 mA
FullWave
Peak inverse voltage
1250 V
FullWave
RMS supply voltage
325 V
FullWave
Peak current
300 mA
FullWave

SECTION 2

Rectifier

Characteristic

Heater/filament voltage
28 V
Published heater/filament rating
Heater/filament current
240 mA
Published heater/filament rating
Tube voltage drop
40 V
At 100 mA DC

Other

DC output current
100 mA
FullWave
Peak inverse voltage
1250 V
FullWave
RMS supply voltage
325 V
FullWave
Peak current
300 mA
FullWave