Vacuum Tube - 12AX7 / ECC83, Electro-Harmonix

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

Starting at: $13.75
In stock

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.

Superior high gain short plate format Twin Triode, with ultra-low noise and detailed, musical tone.

  • Ultra-low noise thanks to unique spiral filament which eliminates cathode-to-filament induced hum on certain amps
  • ECC83/7025 equivalent

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 Factor78 min, 92 nominal
Capacitance, Cathode to Heater5.0 nF
Capacitance, Grid to Cathode1.6 pF
Capacitance, Grid to Heater1.6 pF
Capacitance, Plate to Cathode0.44 pF / 0.36 pF
Capacitance, Plate to Heater0.44 pF / 0.36 pF
Capacitance, Plate to Plate520 pF
Capacitance, grid to plate1.6 pF
Grid Circuit Resistance (Rg), Fixed Bias1 MΩ
Grid Circuit Resistance (Rg), Self Bias2.2 MΩ
Grid Reverse Current0.2 μA
Heater Voltage6.0 - 6.6 V / 12.0 - 13.2 V
Heater to Cathode Voltage, Negative200 V
Heater to Cathode Voltage, Positive100 V
Plate Current (Ia)9 mA
Plate Dissipation, per triode (Wa)1.0 W
Plate Resistance (Ra)54.1 kΩ
Plate Voltage (Ua)300 V
Transconductance (S)≥ 1.4 mA/V, 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 Specification Sheet779.58 KB

Questions and Answers

Click each question to see its answers.
Asked by Anonymous on June 20th, 2017.
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.
Asked by Anonymous on November 5th, 2019.
November 5th, 2019
Staff Member
Yes, that should be totally safe.

Product Reviews

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

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

- May 27th, 2011
5 out of 5

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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