Vacuum Tube - 12AX7 / ECC83, Electro-Harmonix

Electro-Harmonix
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Vacuum Tube - 12AX7 / ECC83, Electro-Harmonix

Starting at: $24.45
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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.

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.

SKU:
T-12AX7EH
Item ID:
004458
Brand:
Electro-Harmonix
Part Numbers
Pin TypeOur Part NumberUPC/EAN
RegularT-12AX7EH683274020099
GoldT-12AX7-GOLD-EH841358101762
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 versionT-12AX7-GOLD-EH2.75 in. × 1 in. × 1 in.
Regular versionT-12AX7EH1.1 in. × 1.1 in. × 3.1 in.
Weight (Packaging)Gold versionT-12AX7-GOLD-EH0.0309 lbs.
Regular versionT-12AX7EH0.0353 lbs.
T-12AX7-GOLD-EH - Gold versionAmplification 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
T-12AX7EH - Regular versionAmplification 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

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Specifications, Files, and Documents

PDF: Specification Sheet Specification Sheet779.58 KB
Questions? Contact us at [email protected], or give us a call at 480-296-0890

Product Reviews

4.00 out of 5 based on 8 reviews
Jack Giacin - August 27th, 2023
5 out of 5

Purchased to replace blown out tubes for my Blackstar ht5. The Electro-Harmonix version has a much more aggressive sound then the original tubes. Very pleased with these.

Joey Blanchard - December 10th, 2022
5 out of 5

I put in two of these tubes as the V1 and V2 in my Hot Rod De'Ville 410. These are really just a super simple 12AX7 and when you look at them closely you can tell what I mean. They really do have low noise and microphonics, probably due to their simple design. Everything else about them I can only describe as medium (medium gain, medium tone, medium distortion). For that reason, if you are looking for something that will (probably) work great with any amp or design, these are great. Because it was the first time I was re-tubing my amp, I figured these would be good based on what I had read, and they really are. If you are looking for something that is specifically very high gain or ultra-low microphonics, these might not be for you.

Kevin Smith - November 16th, 2022
5 out of 5

Replaced the generic tube in the V1 of my Stage Right 15 watt. And the difference was great! Distortion was tighter and much more focused,

fraberjam - June 12th, 2021
1 out of 5

Bought 4 of these to retube my Peavey VTM 120 and 2 died within 20 minutes of installation. The two I got are great with lots of volume and round off highs and lows but the fail rate is still too high to ever consider getting these again.

Bernie - November 14th, 2020
1 out of 5

First, they didn’t include 5 Ehx 12ax7 in my order.
Second, when they shipped and arrived 2 tubes are faulty.

RobT - April 14th, 2020
5 out of 5

I’m so happy I found your site. Have had this amp since around 1990, fender champ 12. Nice amp, with the new tube, so much more “complete” sounding. Haven’t changed anything else, yet. Wanted to start here. Cannot wait to actually jam it LOUD, as apartment life keeps it low. But found the tone to be rich and warm.

Raydog - September 8th, 2018
5 out of 5

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

Anonymous - 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..

Substitute Products

The following items can be substituted for this product. While not necessarily exactly the same, they will function as replacement items in your project.