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Voltage Triode Pentode ·Pentode-Triode

6AB8

Common-cathode triode plus power pentode for television frame time-base, sync-separator, and audio-output service.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
2
Base
DAT
Socket code
B9A
Base pins
9
Nominal heater
6.3 V / 300 mA

Description

Common-cathode triode-pentode, co-designated ECL80/6AB8, for television frame time-base, sync-separator, and audio-output service.

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
DAT
Socket code
B9A
Base pins
9
Nominal heater voltage
6.3 V
Nominal heater current
300 mA
Parallel heater voltage
-
Parallel heater current
-
Series capable
No

DAT - 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
150000 Ω
Transconductance
0.0034 S
Amplification factor
17.5
Max plate voltage
350 V
Max plate dissipation
1 W
Max cathode current
15 mA

Published maximum ratings and representative operating characteristics reviewed.

Section 2

Pentode

X-ray radiationInterelectrode capacitances
Plate resistance
150000 Ω
Transconductance
0.0034 S
Max plate voltage
350 V
Max screen voltage
250 V
Max plate dissipation
3.9 W
Max screen dissipation
0.75 W
Max cathode current
25 mA

Published maximum ratings and representative operating characteristics reviewed.

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

1958 Brimar Radio Valve No 7

Published operating points and test conditions from this source.

SECTION 1

Triode

Characteristic

  • Application

    Frame blocking oscillator / AF voltage amplifier

    TriodeSection

SECTION 2

Pentode

Characteristic

  • Application

    Frame output / sync separator / audio output

    PentodeSection

Data set 02

195X General Electric Essential Characteristics

Published operating points and test conditions from this source.

SECTION 2

Pentode

Other

  • Maximum plate voltage

    350 V

    Published handbook rating

  • Maximum screen voltage

    250 V

    Published handbook rating

  • Plate voltage

    200 V

    ClassA

  • Screen voltage

    200 V

    ClassA

  • Control-grid bias

    7.7 V

    ClassA

  • Plate current

    17.5 mA

    ClassA

  • Screen current

    3.3 mA

    ClassA

  • Load resistance

    11000 ohm

    ClassA

  • Power output

    1.4 W

    ClassA

Characteristic

  • Plate resistance

    150000 ohm

    Published handbook characteristic

  • Transconductance

    3400 µS

    Published handbook characteristic

  • Heater/filament voltage

    6.3 V

    Published heater/filament rating

  • Heater/filament current

    300 mA

    Published heater/filament rating

Data set 03

1961 Ferranti Technical Handbook

Published operating points and test conditions from this source.

SECTION 1

Triode

Characteristic

  • HeaterOrFilamentVoltage

    6.3 V

  • HeaterOrFilamentCurrent

    300 mA

  • Application

    Frame blocking oscillator line blocking oscillator audio voltage amplifier

SECTION 2

Pentode

Characteristic

  • Application

    Frame output sync separator audio output

Data set 04

1999 Philips 0-D

Published operating points and test conditions from this source.

SECTION 1

Triode

Capacitance

  • Triode plate-grid capacitance

    1 pF

  • Triode grid-cathode capacitance

    2.3 pF

  • Triode plate-cathode capacitance

    1.1 pF

SECTION 2

Pentode

Characteristics

  • Heater voltage

    6.3 V

  • Heater current

    300 mA

  • Transconductance

    3400 uS

    Pentode

  • Plate resistance

    150000 ohm

    Pentode

Other

  • Plate voltage

    200 V

    Pentode;PowerAmplifier

  • Screen voltage

    200 V

    Pentode;PowerAmplifier

  • Plate current

    17.5 mA

    Pentode;PowerAmplifier

  • Screen current

    3.3 mA

    Pentode;PowerAmplifier

  • Plate load resistance

    11000 ohm

    Pentode;PowerAmplifier

  • Maximum plate dissipation

    3.9 W

    Pentode

  • Maximum screen dissipation

    0.75 W

    Pentode

Capacitance

  • Pentode input capacitance

    4.6 pF

  • Pentode output capacitance

    4.7 pF