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Rectifier - Half Wave ·Rectifier

25DK4

Miniature indirectly heated half-wave rectifier for line-operated equipment with series-connected 150 mA heaters. Its tapped 25 V heater can serve as a current-limiting resistor while providing approximately 100 mA output.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
E7-1
Socket code
B7G
Base pins
7
Nominal heater
25 V / 150 mA

Description

The 25DK4 is a miniature half-wave rectifier for line-operated equipment with series-connected 150-mA heaters and a tapped heater usable as a current-limiting resistor.

Socket description

Miniature 7-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
E7-1
Socket code
B7G
Base pins
7
Nominal heater voltage
25 V
Nominal heater current
150 mA
Parallel heater voltage
-
Parallel heater current
-
Series capable
No

E7-1 - 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
330 V
Rectifier nominal output current
100 mA
Rectifier peak forward current
600 mA
Rectifier forward voltage drop
19 V
Rectifier max heater-cathode voltage
330 V

Half-wave power rectifier. Voltage drop is published at 200 mA DC.

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

1968 General Electric Co

Published operating points and test conditions from this source.

SECTION 1

Rectifier

Other

  • AC Plate-Supply Voltage RMS

    117 V

    HalfWaveCapacitorInputFilter

  • Filter Input Capacitor

    40 uF

    HalfWaveCapacitorInputFilter

Characteristic

  • Typical DC Output Current

    90 mA

    HalfWaveCapacitorInputFilter

  • DC Output Voltage at Filter Input

    113 V

    HalfWaveCapacitorInputFilter