Skip to main content
Tube Tinker — Electron Tube Database
Alternatives & variationsDownload PDF datasheet

Power - Beam Single (NOT sweep) (under 10W) ·BeamPower

7A5

Lock-In beam-power amplifier for low-voltage audio output, providing approximately 1.5 W single-ended Class-A power from roughly 110 V supplies.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
6AA
Socket code
LOCTAL8
Base pins
8
Nominal heater
6.3 V / 700 mA

Description

A Lock-In beam-power amplifier tube intended for power-output service.

Socket description

Loctal 8-contact base

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
6AA
Socket code
LOCTAL8
Base pins
8
Nominal heater voltage
6.3 V
Nominal heater current
700 mA
Parallel heater voltage
-
Parallel heater current
-
Series capable
No

6AA - Terminal pinout

Electrical assignments shared by every tube using this base designation.

TerminalSectionConnectionEvidence
PIN1Pin 1—H — HeaterVerified

7C5 JEDEC registration, 6AA pin assignment

PIN2Pin 2AP — Plate (Anode)Verified

7C5 JEDEC registration, 6AA pin assignment

PIN3Pin 3AG2 — Screen GridVerified

7C5 JEDEC registration, 6AA pin assignment

PIN4Pin 4—NCVerified

7C5 JEDEC registration, 6AA pin assignment

PIN5Pin 5—NCVerified

7C5 JEDEC registration, 6AA pin assignment

PIN6Pin 6AG1 — Control GridVerified

7C5 JEDEC registration, 6AA pin assignment

PIN7Pin 7ABP — Beam-Forming PlateGroup AA7Verified

7C5 JEDEC registration, 6AA pin assignment

PIN7Pin 7AK — CathodeGroup AA7Verified

7C5 JEDEC registration, 6AA pin assignment

PIN8Pin 8—H — HeaterVerified

7C5 JEDEC registration, 6AA pin assignment

Section ratings

1 physical section, each with unique specifications.

Section 1

Beam Power

X-ray radiationInterelectrode capacitances
Plate resistance
16000 Ω
Transconductance
0.0058 S
Max plate voltage
125 V
Max screen voltage
125 V
Max plate dissipation
5.5 W
Max screen dissipation
1.2 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

Beam Power

Other

  • Maximum plate voltage

    125 V

    Published handbook rating

  • Maximum screen voltage

    125 V

    Published handbook rating

  • Plate voltage

    110 V

    ClassA

  • Screen voltage

    110 V

    ClassA

  • Control-grid bias

    7.5 V

    ClassA

  • Plate current

    40 mA

    ClassA

  • Screen current

    3 mA

    ClassA

  • Load resistance

    2500 ohm

    ClassA

  • Power output

    1.5 W

    ClassA

Characteristic

  • Plate resistance

    16000 ohm

    Published handbook characteristic

  • Transconductance

    5800 µS

    Published handbook characteristic

  • Heater voltage

    6.3 V

    Published heater rating

  • Heater current

    750 mA

    Published heater rating

Data set 02

1961 Tung Sol

Published operating points and test conditions from this source.

SECTION 1

Beam Power

Other

  • Heater voltage

    6.3 V

    Nominal

  • Heater current

    700 mA

    Nominal

  • Plate voltage

    125 V

    Typical operating conditions

  • Screen voltage

    125 V

    Typical operating conditions

  • Plate current

    40 mA

    Typical operating conditions

  • Screen current

    3 mA

    Typical operating conditions