4274A

Directly heated full-wave rectifier documented for power-supply service. Its five-volt filament supports conventional dual-diode full-wave operation; available source material does not justify more specific functional claims.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 2
Base: -
Socket code: MEDIUM4BAYONET
Base pins: 4
Nominal heater: 5 V / 2 A

Description

The 4274A is a rectifier described in the Standard Valves datasheet, using a directly heated filament cathode and published operating data.

Socket description

Medium 4-contact bayonet base

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: MEDIUM4BAYONET
Base pins: 4
Nominal heater voltage: 5 V
Nominal heater current: 2 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

2 physical sections, each with unique specifications.

Section 1

Rectifier

X-ray radiationInterelectrode capacitances

No fixed ratings are recorded for this section.

Ratings and characteristics extracted from 4274A.pdf.

Section 2

Rectifier

X-ray radiationInterelectrode capacitances

No fixed ratings are recorded for this section.

Second physical rectifier section; electrical properties populated from corresponding 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

1937 Standard Valves

Published operating points and test conditions from this source.

SECTION 1

Rectifier

Other

RMS AC voltage per anode
550 V
ChokeInputFilter
Total rectified current
160 mA
ChokeInputFilter
RMS AC voltage per anode
450 V
CapacitorInputFilter
Total rectified current
140 mA
CapacitorInputFilter
Maximum input filter capacitance
4 uF
CapacitorInputFilter

SECTION 2

Rectifier

Other

RMS AC voltage per anode
550 V
ChokeInputFilter
Total rectified current
160 mA
ChokeInputFilter
RMS AC voltage per anode
450 V
CapacitorInputFilter
Total rectified current
140 mA
CapacitorInputFilter
Maximum input filter capacitance
4 uF
CapacitorInputFilter

Data set 02

1946 Standard Telephone and Cables

Published operating points and test conditions from this source.

SECTION 1

Rectifier

Characteristic

Filament voltage
5 volts
Nominal filament curren
2 amps

SECTION 2

Rectifier

Characteristic

Filament voltage
5 volts
Nominal filament curren
2 amps