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Voltage Pentode ·Pentode

7AB7

Pentode documented with manufacturer and handbook Class A operating characteristics. The available source establishes conventional signal-amplifier operation but does not provide sufficiently explicit application or cutoff terminology for narrower classification.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
8BO
Socket code
B8G
Base pins
8
Nominal heater
7 V / 160 mA

Description

The 7AB7 is a Pentode vacuum tube as described by the source datasheet.

Socket description

Loctal 8-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
8BO
Socket code
B8G
Base pins
8
Nominal heater voltage
7 V
Nominal heater current
160 mA
Parallel heater voltage
-
Parallel heater current
-
Series capable
No

8BO - 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 1

Pentode

X-ray radiationInterelectrode capacitances
Plate resistance
500000 Ω
Transconductance
0.0018 S
Max plate voltage
300 V
Max screen voltage
100 V
Max plate dissipation
1.2 W
Max screen dissipation
0.15 W

Published handbook 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

195X General Electric Essential Characteristics

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

  • Maximum plate voltage

    300 V

    Published handbook rating

  • Maximum screen voltage

    150 V

    Published handbook rating

  • Plate voltage

    250 V

    ClassA

  • Screen voltage

    100 V

    ClassA

  • Control-grid bias

    2 V

    ClassA

  • Plate current

    4 mA

    ClassA

  • Screen current

    1.3 mA

    ClassA

Characteristic

  • Plate resistance

    500000 ohm

    Published handbook characteristic

  • Transconductance

    1800 µS

    Published handbook characteristic

  • Heater voltage

    6.3 V

    Published heater rating

  • Heater current

    150 mA

    Published heater rating

Data set 02

1961 Tung Sol

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

  • Heater voltage

    7 V

    Nominal

  • Heater current

    160 mA

    Nominal

  • Plate voltage

    300 V

    Typical operating conditions

  • Screen voltage

    100 V

    Typical operating conditions