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

ECC803

High-mu twin triode intended for low-frequency voltage amplification, providing two similar sections for high-gain audio and general small-signal amplifier circuits.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
2
Base
-
Socket code
B9A
Base pins
9
Nominal heater
12.6 V / 150 mA

Description

A nine-pin audio-frequency twin triode explicitly described as non-microphonic, with separate cathodes, amplification factor 100, and resistance-coupled amplifier operating data.

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
12.6 V
Nominal heater current
150 mA
Parallel heater voltage
6.3 V
Parallel heater current
300 mA
Series capable
Yes

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
62500 Ω
Transconductance
0.0016 S
Amplification factor
100
Max plate voltage
330 V
Max plate dissipation
1.2 W
Max cathode current
9 mA

A.F. twin triode with separate cathodes, explicitly described as non-microphonic.

Section 2

Triode

X-ray radiationInterelectrode capacitances
Plate resistance
62500 Ω
Transconductance
0.0016 S
Amplification factor
100
Max plate voltage
330 V
Max plate dissipation
1.2 W
Max cathode current
9 mA

Second physical triode section; added to align rows with SectionCount.

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

199X JJ

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

  • Typical Plate Voltage

    250 V

  • Typical Plate Current

    1.2 mA

Characteristic

  • Grid Cathode Capacitance

    1.6 pF

  • Plate Capacitance

    0.46 pF

  • GridPlateCapacitance

    1.7 pF

  • PlateCapacitanceSystem1

    0.46 pF

    Section1

  • PlateCapacitanceSystem2

    0.34 pF

    Section2