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

Power - TV Horizontal Output (sweep) ·BeamPower

25CU6

Beam-power tube designed for horizontal-deflection amplifier service in color and black-and-white television receivers.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
6AM
Socket code
IO
Base pins
7
Nominal heater
25 V / 300 mA

Description

Beam power tube for horizontal-deflection amplifier service in color and black-and-white 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
6AM
Socket code
IO
Base pins
7
Nominal heater voltage
25 V
Nominal heater current
300 mA
Parallel heater voltage
-
Parallel heater current
-
Series capable
No

6AM - Terminal pinout

Electrical assignments shared by every tube using this base designation.

TerminalSectionConnectionEvidence
PIN1Pin 1—NC

May be omitted on some physical base variants

Verified

6AM manufacturer basing; 12DQ6A Tung-Sol, 6BQ6GT Sylvania/Tung-Sol; bottom view

PIN2Pin 2—H — HeaterVerified

6AM manufacturer basing; 12DQ6A Tung-Sol, 6BQ6GT Sylvania/Tung-Sol; bottom view

PIN3Pin 3—NCVerified

6AM manufacturer basing; 12DQ6A Tung-Sol, 6BQ6GT Sylvania/Tung-Sol; bottom view

PIN4Pin 4AG2 — Screen GridVerified

6AM manufacturer basing; 12DQ6A Tung-Sol, 6BQ6GT Sylvania/Tung-Sol; bottom view

PIN5Pin 5AG1 — Control GridVerified

6AM manufacturer basing; 12DQ6A Tung-Sol, 6BQ6GT Sylvania/Tung-Sol; bottom view

PIN7Pin 7—H — HeaterVerified

6AM manufacturer basing; 12DQ6A Tung-Sol, 6BQ6GT Sylvania/Tung-Sol; bottom view

PIN8Pin 8ABP — Beam-Forming PlateGroup AM8Verified

6AM manufacturer basing; 12DQ6A Tung-Sol, 6BQ6GT Sylvania/Tung-Sol; bottom view

PIN8Pin 8AK — CathodeGroup AM8Verified

6AM manufacturer basing; 12DQ6A Tung-Sol, 6BQ6GT Sylvania/Tung-Sol; bottom view

CAP1Top capAP — Plate (Anode)Verified

6AM manufacturer basing; 12DQ6A Tung-Sol, 6BQ6GT Sylvania/Tung-Sol; bottom view

Section ratings

1 physical section, each with unique specifications.

Section 1

Beam Power

X-ray radiationInterelectrode capacitances
Plate resistance
14500 Ω
Transconductance
0.0059 S
Amplification factor
4.5
Max plate voltage
600 V
Max screen voltage
200 V
Max plate dissipation
11 W
Max screen dissipation
2.5 W
Max cathode current
110 mA

DC plate-supply voltage used for promoted DC plate limit; pulse ratings 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

195X General Electric Essential Characteristics

Published operating points and test conditions from this source.

SECTION 1

Beam Power

Capacitance

  • Input capacitance

    15 pF

  • Output capacitance

    7 pF

  • Grid-to-plate capacitance

    0.55 pF

Other

  • Plate voltage

    250 V

    HorizontalDeflection

  • Screen-grid voltage

    150 V

    HorizontalDeflection

  • Grid voltage

    -22.5 V

    HorizontalDeflection

  • Plate current

    55 mA

    HorizontalDeflection

  • Screen-grid current

    2.1 mA

    HorizontalDeflection

  • Plate voltage

    60 V

    HorizontalDeflection;PeakDrive

  • Screen-grid voltage

    150 V

    HorizontalDeflection;PeakDrive

  • Grid voltage

    0 V

    HorizontalDeflection;PeakDrive

  • Plate current

    225 mA

    HorizontalDeflection;PeakDrive

  • Screen-grid current

    25 mA

    HorizontalDeflection;PeakDrive

  • Maximum positive pulse plate voltage

    6000 V

    HorizontalDeflection;Pulse

Data set 02

1961 Tung Sol

Published operating points and test conditions from this source.

SECTION 1

Beam Power

Other

  • Heater voltage

    25 V

    Nominal

  • Heater current

    300 mA

    Nominal

  • Maximum peak positive pulse plate voltage

    6000 V

    HorizontalDeflection

  • Maximum peak negative pulse plate voltage

    1250 V

    HorizontalDeflection

  • Maximum peak cathode current

    400 mA

    HorizontalDeflection

  • Plate voltage

    250 V

    Typical operating conditions

  • Screen voltage

    150 V

    Typical operating conditions

  • Grid 1 voltage

    -22.5 V

    Typical operating conditions

Characteristic

  • Plate current

    55 mA

    Typical operating conditions

  • Grid 2 current

    2.1 mA

    Typical operating conditions

  • Transconductance

    5500 uS

    Typical operating conditions

  • Plate resistance

    20000 ohm

    Typical operating conditions

  • Triode amplification factor

    4.3

    Typical operating conditions

Capacitance

  • Grid 1 to plate

    0.55 pF

    Direct interelectrode capacitance

  • Input capacitance

    15 pF

    Direct interelectrode capacitance

  • Output capacitance

    7 pF

    Direct interelectrode capacitance

Data set 03

1965 Westinghouse Data Book

Published operating points and test conditions from this source.

SECTION 1

Beam Power

Characteristics

  • Heater Voltage

    25 V

  • Heater Current

    300 mA

  • Grid-Plate Capacitance

    0.6 pF

  • Input Capacitance

    15 pF

  • Output Capacitance

    7 pF

  • Cutoff Plate Voltage

    250 V

  • Cutoff Screen Voltage

    150 V

  • Cutoff Grid Voltage

    -43 V

  • Triode Amplification Factor

    4.3 ratio

    ScreenTiedToPlate

Other

  • Maximum DC Plate Supply Voltage

    600 V

    HorizontalDeflection

  • Maximum Peak Positive Plate Voltage

    6000 V

    Pulse

  • Maximum Peak Negative Plate Voltage

    -1250 V

    Pulse

  • Maximum Plate Dissipation

    11 W

  • Maximum Screen Voltage

    200 V

  • Maximum Screen Dissipation

    2.5 W

  • Maximum Average Cathode Current

    110 mA

  • Maximum Peak Cathode Current

    400 mA

Data set 04

1966 Tung Sol Electronic Tubes 3 of 4

Published operating points and test conditions from this source.

SECTION 1

Beam Power

Other

  • Heater voltage

    25 V

    TypicalOperation

  • Heater current

    300 mA

    TypicalOperation

  • Maximum DC plate supply voltage

    550 V

    WholeTube

  • Maximum positive pulse plate voltage

    6000 V

    HorizontalDeflection

  • Maximum negative pulse plate voltage

    1250 V

    HorizontalDeflection

  • Maximum average cathode current

    110 mA

    WholeTube

  • Maximum peak cathode current

    400 mA

    WholeTube

  • Plate current

    55 mA

    TypicalOperation

  • Screen current

    2.1 mA

    TypicalOperation

  • Transconductance

    5500 µS

    TypicalOperation

  • Plate resistance

    20000 ohm

    TypicalOperation

Characteristic

  • Grid 1-to-plate capacitance

    0.55 pF

    WholeTube

  • Output capacitance

    7 pF

    WholeTube

Data set 05

1968 General Electric Co

Published operating points and test conditions from this source.

SECTION 1

Beam Power

Other

  • HeaterVoltageNominal

    25 V

  • HeaterCurrentNominal

    300 mA

  • Peak Positive Pulse Plate Voltage

    6000 V

    HorizontalDeflection

  • Peak Negative Pulse Plate Voltage

    1250 V

    HorizontalDeflection

  • Peak Cathode Current

    400 mA

    HorizontalDeflection

Characteristic

  • Plate Resistance

    14500 Ohm

  • Transconductance

    5900 uS

Data set 06

1971 RCA HB3 Binder 5 of 7

Published operating points and test conditions from this source.

SECTION 1

Beam Power

Other

  • Maximum Plate Voltage

    700 V

  • Maximum Screen Voltage

    175 V

  • Plate Dissipation

    15 W

  • Screen Input

    3 W

Characteristics

  • Plate Resistance

    4000 Ω

  • Transconductance

    10000 µS

Data set 07

1975 RCA RC30

Published operating points and test conditions from this source.

SECTION 1

Beam Power

Other

  • Heater-Cathode Voltage:

    11 s

    Other

  • Peak value

    200 V

    Other;PublishedValue1

  • Peak value

    200 V

    Other;PublishedValue2

  • Peak value

    200 V

    Other;PublishedValue3

  • Average value

    100 V

    Other;PublishedValue1

  • Average value

    100 V

    Other;PublishedValue2

  • Average value

    100 V

    Other;PublishedValue3

Capacitance

  • Plate to Cathode, Heater, Grid No

    2 pF

    Capacitance;PublishedValue1

  • Plate to Cathode, Heater, Grid No

    3 pF

    Capacitance;PublishedValue2

  • Plate to Cathode, Heater, Grid No

    7 pF

    Capacitance;PublishedValue3

Characteristic

  • Plate Voltage

    60 V

    Characteristic;PublishedValue1

  • Plate Voltage

    150 V

    Characteristic;PublishedValue2

  • Plate Voltage

    250 V

    Characteristic;PublishedValue3

  • Grid-No

    2 V

    Characteristic;PublishedValue1

  • Grid-No

    150 V

    Characteristic;PublishedValue2

  • Grid-No

    150 V

    Characteristic;PublishedValue3

  • Grid-No

    150 V

    Characteristic;PublishedValue4

  • Grid-No

    1 V

    Characteristic;PublishedValue1

  • Grid-No

    0 V

    Characteristic;PublishedValue2

  • Grid-No

    22.5 V

    Characteristic;PublishedValue3

  • Grid-No

    -22.5 V

    Characteristic;PublishedValue4

  • Plate Resistance (Approx.) —

    14500 ohm

    Characteristic

  • Plate Current

    260 mA

    Characteristic;PublishedValue1

  • Plate Current

    57 mA

    Characteristic;PublishedValue2

  • Grid-No

    2 mA

    Characteristic;PublishedValue1

  • Grid-No

    26 mA

    Characteristic;PublishedValue2

  • Grid-No

    2.1 mA

    Characteristic;PublishedValue3