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Power - Triode ·Triode

6A5G

Indirectly heated power triode for Class-A and push-pull audio-output amplifier stages, closely related electrically to the directly heated 6A3.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
6T
Socket code
IO
Base pins
6
Nominal heater
6.3 V / 1.25 A

Description

Power triode for Class-A and push-pull output-amplifier service, with characteristics closely related to the 6A3 but an indirectly heated cathode.

Socket description

International Octal

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
6T
Socket code
IO
Base pins
6
Nominal heater voltage
6.3 V
Nominal heater current
1.25 A
Parallel heater voltage
-
Parallel heater current
-
Series capable
No

6T - 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

Triode

X-ray radiationInterelectrode capacitances
Plate resistance
800 Ω
Transconductance
0.00525 S
Amplification factor
4.2
Max plate voltage
325 V

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

Triode

Capacitance

  • Grid-to-plate capacitance

    16 pF

    Section1

  • Input capacitance

    7 pF

    Section1

  • Output capacitance

    5 pF

    Section1

Other

  • Plate voltage

    250 V

    ClassA

  • Control-grid voltage

    -45 V

    ClassA

  • Plate current

    60 mA

    ClassA

  • Load resistance

    2600 Ω

    ClassA

  • Power output

    3.75 W

    ClassA

  • Plate voltage

    325 V

    ClassAB;PushPull;TwoTubes

  • Load resistance plate-to-plate

    3000 Ω

    ClassAB;PushPull;TwoTubes;FixedBias

  • Power output

    15 W

    ClassAB;PushPull;TwoTubes;FixedBias

Characteristic

  • Plate resistance

    800 Ω

    Section1

  • Transconductance

    5250 µS

    Section1

  • Amplification factor

    4.2

    Section1

Data set 02

1950 Sylvania

Published operating points and test conditions from this source.

SECTION 1

Triode

Characteristic

  • Plate Resistance

    800 ohm

  • Transconductance

    5250 µS

  • Amplification Factor

    4.2

Other

  • Maximum Plate Voltage

    325 V

Data set 03

195X General Electric Essential Characteristics

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

  • Maximum plate voltage

    250 V

    Published handbook rating

  • Plate voltage

    250 V

    ClassA

  • Control-grid bias

    45 V

    ClassA

  • Plate current

    60 mA

    ClassA

  • Load resistance

    2500 ohm

    ClassA

  • Power output

    3.75 W

    ClassA

Characteristic

  • Plate resistance

    800 ohm

    Published handbook characteristic

  • Transconductance

    5250 µS

    Published handbook characteristic

  • Amplification factor

    4.2

    Published handbook characteristic

  • Heater/filament voltage

    6.3 V

    Published heater/filament rating

  • Heater/filament current

    1.25 A

    Published heater/filament rating