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Power - TV Vertical Output ·BeamPower-Triode

15A8

Combination medium-mu triode and beam pentode designed for television vertical-deflection oscillator and amplifier service, with controlled heater warm-up for series-string receivers.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
2
Base
-
Socket code
B9A
Base pins
9
Nominal heater
15 V / 450 mA

Description

The 15A8 combines a medium-mu triode with a beam pentode for use as a television vertical-deflection oscillator and amplifier, with controlled heater warm-up characteristics.

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
-
Socket code
B9A
Base pins
9
Nominal heater voltage
15 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

2 physical sections, each with unique specifications.

Section 1

Triode

X-ray radiationInterelectrode capacitances
Plate resistance
7700 Ω
Transconductance
0.0026 S
Amplification factor
20
Max plate voltage
300 V
Max plate dissipation
2.5 W
Max cathode current
20 mA

Promoted from published ratings/characteristics tables; additional operating points and capacitances retained in TUBE_SECTION_PARAMETER.

Section 2

Beam Power

X-ray radiationInterelectrode capacitances
Plate resistance
13000 Ω
Transconductance
0.0073 S
Max plate voltage
500 V
Max screen voltage
190 V
Max plate dissipation
2.5 W
Max screen dissipation
1.25 W
Max cathode current
40 mA

Promoted from published ratings/characteristics tables; additional operating points and capacitances retained in TUBE_SECTION_PARAMETER.

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

1966 Tung Sol Electronic Tubes 3 of 4

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

  • Typical plate voltage

    90 V

    VerticalDeflection

  • Maximum plate voltage

    300 V

    PromotedValue

  • Maximum plate dissipation

    2.5 W

    PromotedValue

  • Maximum cathode current

    20 mA

    PromotedValue

Capacitance

  • Grid-to-plate capacitance

    4.5 pF

  • Input capacitance

    2.2 pF

  • Output capacitance

    0.9 pF

Characteristics

  • Plate resistance

    7700 ohm

    PromotedValue

  • Transconductance

    0.0026 A/V

    PromotedValue

  • Amplification factor

    20

    PromotedValue

SECTION 2

Beam Power

Other

  • Typical plate voltage

    110 V

    VerticalDeflection

  • Maximum peak positive pulse plate voltage

    1200 V

    VerticalDeflection

  • Maximum peak cathode current

    140 mA

    VerticalDeflection

  • Maximum plate voltage

    300 V

    PromotedValue

  • Maximum screen voltage

    150 V

    PromotedValue

  • Maximum plate dissipation

    10 W

    PromotedValue

  • Maximum screen dissipation

    1.25 W

    PromotedValue

  • Maximum cathode current

    40 mA

    PromotedValue

Capacitance

  • Grid-to-plate capacitance

    0.2 pF

  • Input capacitance

    11 pF

  • Output capacitance

    5 pF

Characteristics

  • Plate resistance

    13000 ohm

    PromotedValue

  • Transconductance

    0.0073 A/V

    PromotedValue