Skip to main content
Tube Tinker — Electron Tube Database
Alternatives & variationsDownload PDF datasheet

Rectifier - Damper Diode ·Rectifier

25DL3

Television horizontal-deflection damper rectifier with a series-string heater, designed to return stored sweep energy while tolerating high repetitive inverse voltage.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
-
Socket code
IO
Base pins
9
Nominal heater
25.2 V / 450 mA

Description

Half-wave vacuum rectifier used as a damper tube in television receivers.

Socket description

International Octal

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
-
Socket code
IO
Base pins
9
Nominal heater voltage
25.2 V
Nominal heater current
450 mA
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
Max plate dissipation
11 W
Rectifier peak inverse voltage
6500 V
Rectifier nominal output current
400 mA
Rectifier peak forward current
1.8 A
Rectifier forward voltage drop
25 V
Rectifier max heater-cathode voltage
6500 V
Rectifier warm-up time
11 s

Published ratings, characteristics, operating conditions, and capacitances extracted from the approved source; pulse-only values remain explicit parameter rows.

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

1975 RCA RC30

Published operating points and test conditions from this source.

SECTION 1

Rectifier

Other

  • : :

    2.3 V

    Other;PublishedValue1

  • : :

    25.2 V

    Other;PublishedValue2

  • Heater Warm-up Time (average) —

    11 s

    Other

  • Peak Inverse Plate Voltage

    6500 V

    Section1;Promoted

  • Average Plate Current

    400 mA

    Section1;Promoted

  • Peak Plate Current

    1.8 A

    Section1;Promoted

Capacitance

  • Cathode to Plate and Heater

    17 pF

    Capacitance

  • Heater to Cathode

    4.4 pF

    Capacitance

  • Peak Inverse Plate Voltage*

    6500 V

    Capacitance

  • Peak Plate Current

    1800 mA

    Capacitance

  • Average Plate Current

    400 mA

    Capacitance

  • Plate Dissipation

    11 W

    Capacitance

  • Peak value

    300 V

    Capacitance;PublishedValue1

  • Peak value

    -6500 V

    Capacitance;PublishedValue2

  • Average value

    -900 V

    Capacitance

  • Tube Voltage Drop for plate current of

    800 mA

    Capacitance;PublishedValue1

  • Tube Voltage Drop for plate current of

    25 mA

    Capacitance;PublishedValue2

Characteristic

  • Forward Voltage Drop

    25 V

    Section1;Promoted