What is the ECC83 vacuum tube?

The ECC83 is a triode vacuum tube designed for preamp applications. European 12AX7..

What is a ECC83 substitute or equivalent?

Direct equivalents to the ECC83 include 12AX7. These share the same pinout and operating envelope, so they can usually be swapped without circuit changes — though batch-to-batch variations between manufacturers (NOS vs current production) may shift the sonic character noticeably.

What are the key specifications of the ECC83?

Amplification factor μ ≈ 100, transconductance gm ≈ 1.6 mA/V, plate resistance rp ≈ 62.5 kΩ, max plate voltage 300 V, max plate dissipation 1 W, heater 6.3 V / 0.3 A.

Is the ECC83 still in production?

Production status varies by year and manufacturer. The current Amperatubes catalog classifies the ECC83 as Common availability. NOS (new-old-stock) examples from RCA, Mullard, Tung-Sol, GE, Sylvania and Telefunken trade among collectors; modern production where it exists comes mostly from JJ Electronic, Electro-Harmonix, Tung-Sol (New Sensor), Genalex, and a handful of small-batch makers.

What does the ECC83 sound like?

European 12AX7.. Sonic character also depends heavily on the circuit operating point, the surrounding tubes in the stage, and the output transformer when present — use the interactive loadline calculator on this page to explore the trade-offs.

ECC83 Triode Vacuum Tube

Also known as 12AX7

High-gain dual triode — the standard for guitar and hi-fi preamps

Dual triodeHeater 6.3 V · 0.3 A9-pin Noval2 sectionsMullard·Telefunken 1953

Plate dissipation: 1W
Max plate voltage: 300V
Amplification factor: 100
Transconductance: 1.6mA/V
Plate resistance: 62.5kΩ

ECC83

Characteristics

Datasheet values, once each. Every value cites its sheet.

HeaterIndirectly heated

Specifications of ECC83 — Heater
Heater voltageVh	6.3 V
Heater currentIh	0.3 A

Limiting valuesDatasheet maximum ratings — not to be exceeded

Specifications of ECC83 — Limiting values
Plate voltageVa max	300 V
Plate dissipationPa max	1 W
Cathode currentIk max	8 mA
Grid resistorRg1 max	2.2 MΩ
Peak plate voltageVao	550 V
Heater–cathode voltageVhk max	180 V

Mechanical

Specifications of ECC83 — Mechanical
Base	9-pin Noval
Rarity	Common
Pinout

Small signalDatasheet parameters at the reference operating point — not limits

Specifications of ECC83 — Small signal
Transconductance	1.6 mA/V
Plate resistance	62.5 kΩ
Amplification factor	100

Capacitances

Specifications of ECC83 — Capacitances
Grid–cathode	1.5 pF
Grid–plate	1.6 pF
Plate–cathode	0.4 pF

Charactereditorial reading, not a measurement

Specifications of ECC83 — Character
Gain	100%
Power	3%
Drive	38%
Linearity	50%

datasheet cited · model or editorial reading · catalogue value, no citation attached yet · nothing invented

Typical operation

Canonical operating pointSPICE model3 availableModel

B+: 300 V
Load: 220 kΩ
Va: 180 V
Ia: 0.79 mA
Vg: -1.6 V
Pd: 0.14 W
Gain: 37.6 dB

At Q: Ayumi Nakabayashi · 3 engines
μ: 95.8
gm: 1.32 mA/V
rp: 72.4 kΩ

Design a stage →

Using this tube

Applications

Voltage amplifier
High-gain preamp
Phase splitter

Fender Tweed preampMarshall JTM45 V1Vox AC30 preampMarantz 7 phono stage

Guitar ampHi-Fi stereoHeadphone ampStudio/recording

Featured in these amplifiers

Replace or compare

Sources

By Jean-Michel Falligan DevergneReviewed May 29, 2026Source : Mullard·Telefunken datasheetActive model : Ayumi Nakabayashi · 3 engines

Manufacturer datasheets

5 manufacturer datasheets cross-checked for ECC835 verified

ECC83 DatasheetLocal mirror · PDF

SPICE models

Revision and verification status

Source: Mullard·Telefunken datasheet
Reviewed: 2026-05-29
Status: DataModelCalc
Model: Ayumi Nakabayashi · 3 engines

Context

The ECC83 is a dual indirectly-heated triode from Mullard·Telefunken, introduced around 1953. It provides a gain factor (μ) of 100 with 62.5kΩ plate resistance. Commonly used in preamp applications. European 12AX7.

History

Introduced: 1953
Manufacturer: Mullard·Telefunken
Era: Golden Age

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