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81

Directly heated single-diode high-voltage rectifier intended for use in pairs in full-wave supplies. Its 7.5 V filament and moderate current capability suit conventional high-voltage DC systems.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: 4B
Socket code: UX4
Base pins: 4
Nominal heater: 7.5 V / 1.25 A

Description

Directly heated single-diode high-voltage rectifier intended for use in pairs. The supplied Emission Labs sheet was read for filament data, maximum ratings, representative operating points, gm/rp/mu, output conditions, capacitances, and rectifier filter conditions as applicable.

Socket description

Medium-shell UX 4-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: 4B
Socket code: UX4
Base pins: 4
Nominal heater voltage: 7.5 V
Nominal heater current: 1.25 A
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

4B - 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

Max plate voltage: 700 V
Rectifier peak inverse voltage: 2000 V
Rectifier nominal output current: 85 mA
Rectifier peak forward current: 500 mA
Rectifier forward voltage drop: 91 V

Published promoted fields populated by semantic section ownership; identical repeated sections compressed.

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 Raytheon Radio Receiving Tubes

Published operating points and test conditions from this source.

SECTION 1

Rectifier

Other

RMS AC plate voltage maximum
700 V
HalfWave
DC output current maximum
85 mA
HalfWave
RMS AC voltage per plate maximum
700 V
FullWave;TwoTubes
DC output current maximum
170 mA
FullWave;TwoTubes

Characteristic

Average tube voltage drop
91 V
At170mADC;TwoTubes

Data set 02

193X Cunningham

Published operating points and test conditions from this source.

SECTION 1

Rectifier

Characteristics

Heater/filament voltage
7.5 V
Published nominal
Heater/filament current
1.25 A
Published nominal

Data set 03

1940 RCA

Published operating points and test conditions from this source.

SECTION 1

Rectifier

Other

AC Input Voltage
700 V RMS
HalfWave

Data set 04

195X General Electric Essential Characteristics

Published operating points and test conditions from this source.

SECTION 1

Rectifier

Other

Maximum RMS supply voltage
700 V
Half-Wave High-Vacuum

Characteristic

Forward voltage drop
91 V
Half-Wave High-Vacuum
Voltage-drop test current
170 mA
Half-Wave

Data set 05

1961 Tung Sol

Published operating points and test conditions from this source.

SECTION 1

Rectifier

Other

ACPlateVoltageRMS
700 V
HalfWave
DC Output Current
85 mA
HalfWave
DC Output Current
170 mA
FullWave;TwoTubes

Data set 06

2026 Emission Labs

Published operating points and test conditions from this source.

SECTION 1

Rectifier

Characteristics

Filament voltage
7.5 V
Filament current
1.25 A

Other

Pair maximum AC input voltage
700 V RMS
TwoTubes;FullWave
Pair maximum DC output current
170 mA
TwoTubes;FullWave
Maximum first capacitor
4 uF
TwoTubes;FullWave