Vacuum Tube - 12AX7/ECC83, Electro-Harmonix

Pictured: Regular
Pictured: Regular
Pictured: Regular
Pictured: Gold
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Vacuum Tube - 12AX7/ECC83, Electro-Harmonix

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This Russian tube is full bodied and bright with a more straightforward presentation. It packs a lot of bite with its higher-than-normal gain. In overdrive, it offers a lot of crunchy fizz. High gain preamplifier tube with ultra low noise and detailed, musical tone. Unique spiral filament eliminates filament to cathode induced hum common on amplifiers that use AC on the filaments. For more information about our 12AX7 tubes, see our tech corner article on 12AX7s.

Item ID:
Part Numbers
Pin TypeOur Part NumberUPC/EAN
Product Measurements
Amplification FactorRegular version78 min, 92 nominal
Capacitance, Cathode To HeaterRegular version5.0 nF
Capacitance, Grid To CathodeRegular version1.6 pF
Capacitance, Grid To HeaterRegular version1.6 pF
Capacitance, Grid To PlateRegular version1.6 pF
Capacitance, Plate To CathodeRegular version0.44 pF / 0.36 pF
Capacitance, Plate To HeaterRegular version0.44 pF / 0.36 pF
Capacitance, Plate To PlateRegular version520 pF
Grid Circuit Resistance, Fixed BiasRegular version1 MΩ
Grid Circuit Resistance, Self BiasRegular version2.2 MΩ
Grid Reverse CurrentRegular version0.2 μA
Heater To Cathode Voltage, NegativeRegular version200 V
Heater To Cathode Voltage, PositiveRegular version100 V
Heater VoltageRegular version6.0 - 6.6 V / 12.0 - 13.2 V
Plate CurrentRegular version0.75 mA
Plate Dissipation, Each TriodeRegular version1.0 W
Plate ResistanceRegular version54.1 kΩ
Plate VoltageRegular version300 V
TransconductanceRegular version1.4 mA/V min, 1.7 mA/V nominal
Packaging Information
Packaging DimensionsGold version2.75 in. × 1 in. × 1 in.
Regular version1.1 in. × 1.1 in. × 3.1 in.
Weight (Packaging)Gold version0.035 lbs.
Regular version0.038 lbs.

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Specifications, Files, and Documents

PDF: Specification Sheet (779.58 KB)Specification Sheet

Questions and Answers

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Asked by Anonymous on June 20th, 2017. 1 person subscribed to this question
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Matt H.
June 20th, 2017
It looks like your amp takes one 12AX7 and two 12AU7's. This Electro-harmonix 12AX7 will work and you can find the 12AU7 on our site.
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Product Reviews

5.00 out of 5 based on 2 reviews
Raydog - September 8th, 2018

So far, so good!! Only have a couple of hours play time, but sound great!

May 27th, 2011

i have these in v1 and v3 of my peavey ultra plus and they sound great.. im thinking about getting more to put in my 6505.. i love this tube..

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