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872AX

Directly heated mercury-vapor half-wave rectifier for high-voltage electronic equipment. Its heavy filament and low arc voltage provide ampere-class DC output.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: -
Base pins: -
Nominal heater: 5 V / 7.5 A

Description

Mercury-vapor half-wave rectifier for high-voltage equipment.

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: -
Base pins: -
Nominal heater voltage: 5 V
Nominal heater current: 7.5 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: 10000 V
Rectifier nominal output current: 1.25 A
Rectifier peak forward current: 5 A
Rectifier forward voltage drop: 10 V
Rectifier warm-up time: 30 s

Promoted from source fields where the locked schema has a direct semantic match; remaining RF, rectifier, capacitance, thermal, and radiation-counter data are retained in TUBE_SECTION_PARAMETER.

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 Amperex Industrial

Published operating points and test conditions from this source.

SECTION 1

Rectifier

Other

Filament voltage
5 V
MercuryVapor
Filament current
7.5 A
MercuryVapor
Peak inverse anode voltage maximum
10000 V
HalfWave;MercuryVapor
Peak anode current maximum
5 A
HalfWave;MercuryVapor
Average anode current maximum
1.25 A
HalfWave;MercuryVapor
Recommended mercury temperature range
Mercury +20 to +60 °C
MercuryVapor
Surge current maximum
50 A
HalfWave;MercuryVapor

Characteristic

Filament heating time
30 s
MercuryVapor
Tube voltage drop
10 V
MercuryVapor

Data set 02

1963 Amperex Condensed

Published operating points and test conditions from this source.

SECTION 1

Rectifier

Characteristic

Filament heating time
30 s
HalfWave;MercuryVapor
Tube voltage drop
10 V
HalfWave;MercuryVapor

Other

Peak inverse anode voltage maximum
10000 V
HalfWave;MercuryVapor
Peak anode current maximum
5 A
HalfWave;MercuryVapor
Average anode current maximum
1.25 A
HalfWave;MercuryVapor
Recommended mercury temperature range
+20 to +60 °C
MercuryVapor
Surge current maximum
50 A
HalfWave;MercuryVapor