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

6BN5

High-transconductance power pentode for Class A audio output, producing approximately 2.8 W.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
9CR
Socket code
B9A
Base pins
9
Nominal heater
6.3 V / 200 mA

Description

Power-amplifier pentode for Class-A output service.

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

9CR - 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
3200 Ω
Transconductance
0.009 S
Max plate voltage
300 V
Max screen voltage
300 V
Max plate dissipation
5 W
Max cathode current
60 mA

Promoted from the printed maximum-rating/characteristic columns; additional operating-point data retained as section 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

195X General Electric Essential Characteristics

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

  • Plate voltage

    225 V

    ClassA

  • Screen voltage

    225 V

    ClassA

  • Cathode resistor

    360 Ω

    ClassA

  • Plate current

    26 mA

    ClassA

  • Screen current

    4.1 mA

    ClassA

  • Power output

    2.8 W

    ClassA

Characteristic

  • Plate resistance

    3200 Ω

    ClassA

  • Transconductance

    9000 µS

    ClassA

Data set 02

1999 Philips 0-D

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristics

  • Heater voltage

    6.3 V

  • Heater current

    200 mA

Other

  • Class A plate voltage

    200 V

    ClassA

  • Class A screen voltage

    200 V

    ClassA

  • Class A plate current

    22.5 mA

    ClassA

  • Class A screen current

    3.5 mA

    ClassA

  • Class A transconductance

    3200 uS

    ClassA

  • Class A load resistance

    9000 ohm

    ClassA

  • Class A output power

    2.1 W

    ClassA

  • Class AB push-pull output power

    7 W

    ClassAB;PushPull;TwoTubes

  • Class B push-pull output power

    6.5 W

    ClassB;PushPull;TwoTubes