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Power - TV Horizontal Output (sweep) ·BeamPower

25BQ6GA

Beam-power horizontal-deflection output pentode for television line-output service, with a 6000-volt positive plate-pulse rating.

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

Description

Beam-power horizontal-deflection output pentode for television line-output service.

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
-
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
20000 Ω
Transconductance
0.0055 S
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

Horizontal-deflection beam-power section.

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

    14 pF

  • Output capacitance

    6.5 pF

  • Grid-to-plate capacitance

    0.8 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

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