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Voltage Radio Detector Converter ·Heptode

6A8G

Glass-envelope pentagrid oscillator-converter for superheterodyne radio receivers. It combines local oscillation and mixing within one multi-grid tube, providing established frequency-changing performance from conventional receiver supplies.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
8A
Socket code
IO
Base pins
8
Nominal heater
6.3 V / 300 mA

Description

6A8G is explicitly printed with 6A8 on the same source and is a pentagrid frequency-converter designation covered by that sheet.

Socket description

International Octal

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
8A
Socket code
IO
Base pins
8
Nominal heater voltage
6.3 V
Nominal heater current
300 mA
Parallel heater voltage
-
Parallel heater current
-
Series capable
No

8A - 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

Heptode

X-ray radiationInterelectrode capacitances
Plate resistance
360000 Ω
Transconductance
0.00055 S
Max plate voltage
300 V
Max screen voltage
100 V
Max plate dissipation
1 W
Max screen dissipation
0.3 W
Max cathode current
14 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

1937 Raytheon Radio Receiving Tubes

Published operating points and test conditions from this source.

SECTION 1

Heptode

Other

  • Plate voltage

    100 V

    Converter

  • Screen voltage

    50 V

    Converter

  • Plate voltage

    250 V

    Converter

  • Screen voltage

    100 V

    Converter

  • Oscillator-grid resistor

    50000 Ω

    Converter

Characteristic

  • Conversion transconductance

    360 µS

    Converter

  • Plate resistance

    300000 Ω

    Converter

  • Conversion transconductance

    550 µS

    Converter

Data set 02

1948 Brimar Radio Valve Manual

Published operating points and test conditions from this source.

SECTION 1

Heptode

Other

  • Oscillator Anode Voltage Maximum

    200 V

    G2

Characteristics

  • Maximum Operating Frequency

    20 MHz

    Suitable circuits

Data set 03

1950 Sylvania

Published operating points and test conditions from this source.

SECTION 1

Heptode

Characteristic

  • Transconductance

    550 µS

  • Conversion Transconductance

    550 µS

Other

  • Maximum Plate Voltage

    300 V

Data set 04

1958 Brimar Radio Valve No 7

Published operating points and test conditions from this source.

SECTION 1

Heptode

Other

  • Plate Voltage

    250 V

  • Plate Current

    3.5 mA

  • Screen Voltage

    100 V

  • Screen Current

    2.7 mA

  • Oscillator Anode Supply Voltage

    250 V

Data set 05

195X General Electric Essential Characteristics

Published operating points and test conditions from this source.

SECTION 1

Heptode

Other

  • Maximum plate voltage

    300 V

    Published handbook rating

  • Maximum screen voltage

    100 V

    Published handbook rating

  • Plate voltage

    250 V

    ClassA

  • Screen voltage

    100 V

    ClassA

  • Control-grid bias

    3 V

    ClassA

  • Plate current

    3.5 mA

    ClassA

  • Screen current

    2.7 mA

    ClassA

Characteristic

  • Plate resistance

    360000 ohm

    Published handbook characteristic

  • Transconductance

    550 µS

    Published handbook characteristic

  • Heater/filament voltage

    6.3 V

    Published heater/filament rating

  • Heater/filament current

    300 mA

    Published heater/filament rating