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Tube Tinker — Electron Tube Database
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Voltage - Dual Triode (similar) ·Triode-Triode

3C6

Medium-mu directly heated twin triode with series/parallel filaments, designed for battery-operated equipment and providing two triode sections for low-voltage amplification.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
2
Base
7BW
Socket code
-
Base pins
7
Nominal heater
2.6 V / 150 mA

Description

Medium-mu twin triode with series/parallel directly heated filaments for battery operation.

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
7BW
Socket code
-
Base pins
7
Nominal heater voltage
2.6 V
Nominal heater current
150 mA
Parallel heater voltage
1.3 V
Parallel heater current
300 mA
Series capable
Yes

7BW - Terminal pinout

Electrical assignments shared by every tube using this base designation.

No verified pinout is recorded for this base designation.

Section ratings

2 physical sections, each with unique specifications.

Section 1

Triode

X-ray radiationInterelectrode capacitances
Plate resistance
11200 Ω
Transconductance
0.0013 S
Amplification factor
14.5
Max plate voltage
130 V

Values promoted only where clearly published for this section in the approved source.

Section 2

Triode

X-ray radiationInterelectrode capacitances
Plate resistance
11200 Ω
Transconductance
0.0013 S
Amplification factor
14.5
Max plate voltage
130 V

Values promoted only where clearly published for this section in the approved source.

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

1938 National Union

Published operating points and test conditions from this source.

SECTION 1

Triode

Characteristic

  • GRID=TO=PiLaTE {EACH

    3 UUF

    Published source value; see source line context.

  • GrRi2 £

    7 UUF

    Published source value; see source line context.

  • PLaT€ CuRRENT (SEScTion Ti)

    4.5 MA

    Published source value; see source line context.

  • TRANSCONDUCTANCE (SECTiONW

    38 umHos

    Published source value; see source line context.

Other

  • MAXiMUM PLATE VOLTASGE

    130 VOLTS

    Published source value; see source line context.

  • Grip YorTact (Eacu SECTioOn)

    0 VOLTS

    Published source value; see source line context.

  • Prate ResisTAnNgE (SgEcTionN =

    1 OHMS

    Published source value; see source line context.

SECTION 2

Triode

Characteristic

  • TRANSCONDUCTANGE (SecTion [

    2 umHos

    Published source value; see source line context.

Data set 02

195X General Electric Essential Characteristics

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

  • Plate voltage

    90 V

    ClassA;ParallelFilaments

  • Grid voltage

    0 V

    ClassA;ParallelFilaments

  • Plate current

    4.5 mA

    ClassA;ParallelFilaments

  • Plate voltage

    90 V

    ClassA;SeriesFilaments

  • Grid voltage

    0 V

    ClassA;SeriesFilaments

  • Plate current

    3.2 mA

    ClassA;SeriesFilaments

Characteristic

  • Plate resistance

    11200 ohm

    ParallelFilaments

  • Transconductance

    1300 uS

    ParallelFilaments

  • Amplification factor

    14.5

    ParallelFilaments

  • Plate resistance

    12800 ohm

    SeriesFilaments

  • Transconductance

    1100 uS

    SeriesFilaments

  • Amplification factor

    14.1

    SeriesFilaments