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HR12

Directly heated high-voltage half-wave vacuum rectifier with thoriated-tungsten filament. Its roughly 36 kV inverse-voltage capability suits specialized low-current high-voltage supplies.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: -
Base pins: -
Nominal heater: 2.5 V / 5 A

Description

Directly heated half-wave high-voltage vacuum rectifier with thoriated-tungsten filament.

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: 2.5 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: 36000 V
Rectifier nominal output current: 25 mA
Rectifier peak forward current: 175 mA
Rectifier warm-up time: 5 s

Published Ferranti ratings and characteristics promoted where applicable; additional electrical, pulse, regulator, microwave, and operating data retained 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

1963 Ferranti

Published operating points and test conditions from this source.

SECTION 1

Rectifier

Application

Application
High-voltage half-wave rectifier
CapacitorInputFilter

Other

PIV no-load
40 kV
CapacitorInputFilter
PIV working
36 kV
CapacitorInputFilter
RMS input voltage maximum
15 kV
CapacitorInputFilter
Peak anode current maximum
175 mA
CapacitorInputFilter
Rectified current maximum
25 mA
CapacitorInputFilter
Reservoir capacitance maximum
0.1 uF
CapacitorInputFilter
Supply impedance minimum
27000 ohm
CapacitorInputFilter
Switching delay minimum
5 s
CapacitorInputFilter