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Power - Pentode (NOT beam) ·Pentode

41

Intermediate-power output pentode designed for audio power-amplifier service. Widely used in receiver output stages, it provides greater load-driving capability than ordinary small-signal pentodes.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
6B
Socket code
B6
Base pins
6
Nominal heater
6.3 V / 400 mA

Description

Intermediate-power output pentode for audio power-amplifier service.

Socket description

European 6-pin base

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
6B
Socket code
B6
Base pins
6
Nominal heater voltage
6.3 V
Nominal heater current
400 mA
Parallel heater voltage
-
Parallel heater current
-
Series capable
No

6B - 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
75000 Ω
Transconductance
0.0021 S
Amplification factor
150
Max plate voltage
345 V
Max screen voltage
315 V
Max plate dissipation
9.4 W
Max screen dissipation
3.1 W
Max cathode current
37.5 mA

Absolute maximum ratings promoted; representative high-voltage Class A characteristics promoted, with lower-voltage and push-pull operating points preserved as parameters.

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

Pentode

Other

  • Plate Voltage

    250 V

    ClassA

  • Screen Voltage

    250 V

    ClassA

  • Grid Voltage

    -18 V

    ClassA

  • Plate Current

    32 mA

    ClassA

  • Screen Current

    5.5 mA

    ClassA

  • Load Resistance

    7600 ohm

    ClassA

  • Power Output

    3.4 W

    ClassA

Data set 02

1940 RCA

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

  • HeaterVoltageNominal

    6.3 V

    Nominal

  • HeaterCurrentNominal

    400 mA

    Nominal

  • Maximum Plate Voltage

    250 V

  • Maximum Screen Voltage

    250 V

  • Maximum Cathode Current

    37.5 mA

Characteristic

  • Transconductance

    2200 µS

    Typical

  • Amplification Factor

    150

    Typical

  • Plate Resistance

    68000 ohm

    Typical

Data set 03

1948 Brimar Radio Valve Manual

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

  • Plate Voltage

    180 V

    Point1

  • Plate Voltage

    250 V

    Point2

  • Plate Current

    18.5 mA

    Point1

  • Plate Current

    32 mA

    Point2

  • Screen Voltage

    180 V

    Point1

  • Screen Voltage

    250 V

    Point2

  • Power Output

    1.5 W

    Point1

  • Power Output

    3.4 W

    Point2

Characteristic

  • Transconductance

    1850 µS

    Point1

  • Transconductance

    2300 µS

    Point2

  • Plate Resistance

    81000 ohm

    Point1

  • Plate Resistance

    68000 ohm

    Point2

Data set 04

1950 Sylvania

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristic

  • Transconductance

    2300 µS

Data set 05

195X General Electric Essential Characteristics

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

  • Plate Voltage

    250 V

    ClassA

  • Screen Voltage

    250 V

    ClassA

  • Grid Voltage

    -18 V

    ClassA

  • Plate Current

    32 mA

    ClassA

  • Screen Current

    5.5 mA

    ClassA

  • Load Resistance

    7600 ohm

    ClassA

  • Power Output

    3.4 W

    ClassA

Data set 06

1961 Tung Sol

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

  • Power Output

    4.5 W

    ClassA1

  • Power Output

    10.5 W

    PushPull

Data set 07

1968 General Electric Co

Published operating points and test conditions from this source.

SECTION 1

Pentode

Capacitance

  • Grid 1 to plate capacitance

    0.5 pF

  • Input capacitance

    5.5 pF

  • Output capacitance

    6 pF

Other

  • D-C heater-cathode voltage maximum

    100 V

  • Maximum-signal plate current

    28 mA

    ClassA;Plate315V;Screen285V

  • Load resistance

    9000 ohm

    ClassA;Plate315V;Screen285V

  • Maximum-signal power output

    4.5 W

    ClassA;Plate315V;Screen285V

Characteristic

  • Plate resistance

    104000 ohm

    ClassA;Plate100V;Screen100V

  • Transconductance

    1500 uS

    ClassA;Plate100V;Screen100V

  • Zero-signal plate current

    25.5 mA

    ClassA;Plate315V;Screen285V