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Power - TV Horizontal Output (sweep) ·BeamPower

25DN6

Beam-power pentode for low-B-plus television horizontal-deflection service, with controlled heater warm-up and high pulse-voltage capability.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
B8-118
Socket code
B9A
Base pins
8
Nominal heater
25 V / 600 mA

Description

The 25DN6 is a beam power amplifier intended for horizontal-deflection service in television receivers using relatively low B-supply voltage, with controlled heater warm-up and high pulse-voltage capability.

Socket description

Small-button Noval 9-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
B8-118
Socket code
B9A
Base pins
8
Nominal heater voltage
25 V
Nominal heater current
600 mA
Parallel heater voltage
-
Parallel heater current
-
Series capable
No

B8-118 - 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 0

Beam Power

X-ray radiationInterelectrode capacitances
Plate resistance
4000 Ω
Transconductance
0.009 S
Amplification factor
4.35
Max plate voltage
700 V
Max screen voltage
175 V
Max plate dissipation
15 W
Max screen dissipation
3 W
Max cathode current
200 mA

Horizontal-deflection service; peak positive pulse plate rating promoted.

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

1950 Sylvania

Published operating points and test conditions from this source.

SECTION 0

Beam Power

Other

  • Peak Positive Pulse Plate Voltage

    6600 V

    Horizontal deflection; absolute maximum

  • Peak Negative Pulse Plate Voltage

    1500 V

  • Peak Cathode Current

    700 mA

Characteristic

  • Plate Current

    70 mA

    125 V plate and screen

Data set 02

1961 Tung Sol

Published operating points and test conditions from this source.

SECTION 0

Beam Power

Other

  • Heater voltage

    25 V

    Nominal

  • Heater current

    600 mA

    Nominal

  • Maximum peak positive pulse plate voltage

    6600 V

    HorizontalDeflection

  • Maximum peak negative pulse plate voltage

    1500 V

    HorizontalDeflection

  • Maximum peak cathode current

    700 mA

    HorizontalDeflection

  • Plate voltage

    125 V

    Typical operating conditions

  • Screen voltage

    125 V

    Typical operating conditions

  • Grid 1 voltage

    -18 V

    Typical operating conditions

Characteristic

  • Heater warm-up time

    11 s

    ControlledWarmup

  • Plate current

    70 mA

    Typical operating conditions

  • Grid 2 current

    6.3 mA

    Typical operating conditions

  • Transconductance

    9000 uS

    Typical operating conditions

  • Plate resistance

    4000 ohm

    Typical operating conditions

  • Zero-bias plate current

    240 mA

    Typical operating conditions

  • Zero-bias grid 2 current

    30 mA

    Typical operating conditions

  • Grid 1 cutoff voltage

    -36 V

    Typical operating conditions

  • Triode amplification factor

    4.35

    Typical operating conditions

Capacitance

  • Grid 1 to plate

    0.8 pF

    Direct interelectrode capacitance

  • Input capacitance

    22 pF

    Direct interelectrode capacitance

  • Output capacitance

    11.5 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 0

Beam Power

Other

  • Heater voltage

    25 V

    TypicalOperation

  • Heater current

    600 mA

    TypicalOperation

  • Maximum DC plate supply voltage

    700 V

    WholeTube

  • Maximum positive pulse plate voltage

    6600 V

    HorizontalDeflection

  • Maximum negative pulse plate voltage

    1500 V

    HorizontalDeflection

  • Maximum average cathode current

    200 mA

    WholeTube

  • Maximum peak cathode current

    700 mA

    WholeTube

  • Heater warm-up time

    11 s

    WholeTube

  • Plate current

    70 mA

    TypicalOperation

  • Screen current

    6.3 mA

    TypicalOperation

  • Transconductance

    7000 µS

    TypicalOperation

  • Plate resistance

    4000 ohm

    TypicalOperation

  • Triode-connected amplification factor

    4.35

    TriodeConnection

Data set 04

1968 General Electric Co

Published operating points and test conditions from this source.

SECTION 0

Beam Power

Other

  • DC Plate-Supply Voltage

    700 V

    HorizontalDeflection

  • Peak Negative Pulse Plate Voltage

    1500 V

    HorizontalDeflection

Data set 05

1971 RCA HB3 Binder 5 of 7

Published operating points and test conditions from this source.

SECTION 0

Beam Power

Other

  • Maximum Plate Voltage

    700 V

  • Maximum Screen Voltage

    175 V

  • Plate Dissipation

    15 W

  • Screen Input

    3 W

  • Plate Voltage

    125 V

  • Screen Voltage

    125 V

Characteristics

  • Plate Resistance

    4000 Ω