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Voltage - Dual Triode (similar) ·Triode-Triode

ECC83MG

High-mu twin triode for low-level audio voltage amplification, a modern ECC83-family variant intended for preamplifier and other high-gain small-signal applications.

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

Description

High-mu audio-frequency double triode in MG construction; also designated ECC83MG. Printed co-designation record duplicated from 12AX7MG.

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
300 V
Max plate dissipation
1 W
Max cathode current
8 mA

Representative section for two electrically identical sections.

Section 2

Triode

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

Second physical triode restored.

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

2026 JJ Electronic

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

  • Rg

    2.2 MΩ

    Published value

Characteristics

  • Ua

    250 V

    Published value

  • Ug

    -2 V

    Published value

  • Ia

    1.2 mA

    Published value

  • S

    1600 µS

    Published value

  • Ri

    62.5 kΩ

    Published value

  • µ

    100

    Published value

Capacitance

  • cg/k

    1.6

    Published value

  • ca

    0.4

    Published value

  • cg/a

    1.7

    Published value