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Power - TV Horizontal Output (sweep) ·BeamPower

25BQ6GT

Beam pentode designed specifically for television horizontal-deflection amplifier service, with a 5500-volt positive plate-pulse rating.

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

Description

Beam pentode designed specifically for television horizontal-deflection amplifier 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
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
20000 Ω
Transconductance
0.0055 S
Amplification factor
4.3
Max plate voltage
550 V
Max screen voltage
175 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

    15 pF

  • Output capacitance

    7.5 pF

  • Grid-to-plate capacitance

    0.6 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

    5500 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 plate surge voltage

    5500 V

    HorizontalDeflection

  • Maximum peak negative grid 1 surge voltage

    -160 V

    HorizontalDeflection

  • Maximum plate current

    110 mA

    HorizontalDeflection

  • Maximum grid 2 input

    2.8 W

    HorizontalDeflection

  • Plate voltage

    250 V

    ClassA

  • Screen voltage

    150 V

    ClassA

  • Grid 1 voltage

    -22.5 V

    ClassA

Characteristic

  • Plate current

    55 mA

    ClassA

  • Grid 2 current

    2.1 mA

    ClassA

  • Transconductance

    5500 uS

    ClassA

  • Grid-2-to-grid-1 amplification factor

    4.5

    ClassA

Capacitance

  • Grid 1 to plate

    0.95 pF

    Direct interelectrode capacitance

  • Input capacitance

    14 pF

    Direct interelectrode capacitance

  • Output capacitance

    9.5 pF

    Direct interelectrode capacitance

Data set 03

1966 Tung Sol Electronic Tubes 3 of 4

Published operating points and test conditions from this source.

SECTION 1

Beam Power

Other

  • DC plate-supply voltage

    550 V

    HorizontalDeflection

  • Peak positive pulse plate voltage

    5500 V

    HorizontalDeflection

  • Peak negative pulse plate voltage

    -1250 V

    HorizontalDeflection

  • Maximum grid #2 voltage

    175 V

    HorizontalDeflection

  • Peak negative grid #1 voltage

    -300 V

    HorizontalDeflection

  • Average cathode current

    110 mA

    HorizontalDeflection

  • Peak cathode current

    400 mA

    HorizontalDeflection

  • Plate voltage

    250 V

    AverageCharacteristics

  • Grid #2 voltage

    150 V

    AverageCharacteristics

  • Plate current

    55 mA

    AverageCharacteristics

  • Grid #2 current

    2.1 mA

    AverageCharacteristics

Characteristic

  • Plate resistance

    20000 ohm

    AverageCharacteristics

  • Transconductance

    5500 uS

    AverageCharacteristics

  • Triode amplification factor

    4.3

    TriodeConnection

Capacitance

  • Grid #1-to-plate capacitance

    0.6 pF

  • Input capacitance

    16 pF

  • Output capacitance

    7 pF