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

6M5

Power pentode with documented Class-A, Class-AB push-pull, and triode-connected audio operating data. Designed for conventional low-frequency power-output stages.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
-
Socket code
B9A
Base pins
9
Nominal heater
6.3 V / 700 mA

Description

A power pentode with Class A, Class AB push-pull, and triode-connected audio operating data, intended for audio power output stages.

Socket description

Small-button Noval 9-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
-
Socket code
B9A
Base pins
9
Nominal heater voltage
6.3 V
Nominal heater current
700 mA
Parallel heater voltage
-
Parallel heater current
-
Series capable
No

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
40000 Ω
Transconductance
0.01 S
Amplification factor
22
Max plate voltage
300 V
Max screen voltage
300 V
Max plate dissipation
9 W
Max screen dissipation
3.3 W
Max cathode current
55 mA

Extracted from supplied datasheet.

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

1999 Philips 0-D

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristics

  • Heater voltage

    6.3 V

  • Heater current

    700 mA

Other

  • Plate voltage

    300 V

  • Plate dissipation

    9 W

  • Screen-grid voltage

    300 V

  • Screen-grid dissipation

    3.3 W

    MaxSignal

  • Cathode current

    55 mA

  • Transconductance

    10000 uS

    ClassA

  • Plate resistance

    40000 Ohm

    ClassA

  • Power output

    3.9 W

    ClassA

  • Grid Yo

    550 volts

    PublishedLine: Grid Yo.2 voltage(without current) 550 volts

  • Grid No

    300 volts

    PublishedLine: Grid No.2 voltage 300 volts

  • input)

    1.4 watts

    PublishedLine: input) 1.4 watts

  • Heater-cathode voltage

    100 volts

    PublishedLine: Heater-cathode voltage 100 volts

  • External grid No

    1 megohm

    PublishedLine: External grid No.1 resistance 1 megohm

  • Ixternal heaster-cathode resistance

    20000 ohms

    PublishedLine: Ixternal heaster-cathode resistance 20,000 ohms

  • Cathode resistor

    170 ohms

    PublishedLine: Cathode resistor 160 140 170 ohms

  • Plate current

    36 mA

    PublishedLine: Plate current 20 30 36 mA

  • Grid No

    5.2 mA

    PublishedLine: Grid No.2 current 2.7 4.1 5.2 mA

  • Mutual conductance

    10000 pmhos

    PublishedLine: Mutual conductance - - 10,000 pmhos

  • R.M.S. signal input voltage

    3.8 volts

    PublishedLine: R.M.S. signal input voltage 2.22 3.0 3.8 volts

  • current +

    4.8 watts

    PublishedLine: current = + 0.3 pA 4.8 watts

  • Grid No.Z2 voltage

    250 volts

    PublishedLine: Grid No.Z2 voltage 250 volts

  • Max.-signal plate current

    39.5 mA

    PublishedLine: Max.-signal plate current 2 x 39.5 mA

  • Zero-signal grid No

    5.2 mA

    PublishedLine: Zero-signal grid No.2 current 2 x 5.2 mA

  • Max.-signal grid No

    8 mA

    PublishedLine: Max.-signal grid No.2 current 2 x 8.0 mA