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Power - Pentode Single (NOT beam) (under 10W) ·Pentode

6AM5

Miniature power pentode for single-ended or two-tube Class A audio-output service.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
6CH
Socket code
B7G
Base pins
6
Nominal heater
6.3 V / 200 mA

Description

Miniature power pentode for Class-A single-ended or two-valve audio output service.

Socket description

Miniature 7-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
6CH
Socket code
B7G
Base pins
6
Nominal heater voltage
6.3 V
Nominal heater current
200 mA
Parallel heater voltage
-
Parallel heater current
-
Series capable
No

6CH - 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
130000 Ω
Transconductance
0.0026 S
Max plate voltage
250 V
Max screen voltage
250 V
Max plate dissipation
4 W
Max screen dissipation
0.6 W

Promoted values from 6AM5.pdf; section type follows printed electrode/function description.

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

1946 Amalgamated Wireless

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristics

  • Heater or filament voltage

    50 V

    Published nominal rating

  • Grid-to-plate capacitance

    0.5 pF

    Direct interelectrode capacitance

  • Input capacitance

    4.2 pF

    Direct interelectrode capacitance

  • Output capacitance

    2 pF

    Direct interelectrode capacitance

Data set 02

1958 Brimar Radio Valve No 7

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

  • Plate Voltage

    250 V

    ClassA

  • Plate Current

    16 mA

    OneTube

  • Plate Current

    22 mA

    TwoTubes

  • Screen Voltage

    250 V

Characteristic

  • Transconductance

    2600 µS

    OneTube

Data set 03

195X General Electric Essential Characteristics

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

  • Maximum plate voltage

    250 V

    Published handbook rating

  • Maximum screen voltage

    250 V

    Published handbook rating

  • Plate voltage

    250 V

    ClassA

  • Screen voltage

    250 V

    ClassA

  • Control-grid bias

    13.5 V

    ClassA

  • Plate current

    16 mA

    ClassA

  • Screen current

    2.4 mA

    ClassA

  • Load resistance

    16000 ohm

    ClassA

  • Power output

    1.4 W

    ClassA

Characteristic

  • Plate resistance

    130000 ohm

    Published handbook characteristic

  • Transconductance

    2600 µS

    Published handbook characteristic

  • Heater voltage

    6.3 V

    Published heater rating

  • Heater current

    200 mA

    Published heater rating