Vacuum Tube - 12AX7 / ECC83, Electro-Harmonix

Vacuum Tube - 12AX7 / ECC83, Electro-Harmonix

Electro-Harmonix
Pictured: Regular
Pictured: Regular
Pictured: Regular
Pictured: Regular
Pictured: Regular
Pictured: Regular
Pictured: Gold
Pictured: Gold
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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 480-820-5411

Product Reviews

4.48 out of 5 based on 25 reviews
seb-ear-aaaaox.net - November 2nd, 2023
2 out of 5

Not at all recommended for use as AC or DC coupled cathode followers or in any inverted cascode circuits. They are just not up to the task at all. Not good for reverb drivers either. They are just not a very robust tube. They are mediocre okay for single inverting gain stages, but also not recommended for any phase inverter duties either. Mid 1980s DC biased Hi Watt PI use will kill these really fast too. That is a quasi cathode follower or as a regulated DC bias supply for a cathodyne PI. Most New Sensor tubes should not be used in any of these circuits.

daggert84rotonmail.com - September 14th, 2023
5 out of 5

These are pretty good. When people say "British" in describing them I think they mean the bass is rolled off relative to the other frequencies so you hear a mid frequency emphasis that works well with crunch and leads, or really high gain sounds. I like them earlier on in the gain stage, V2 or in the last stage before the CF and EQ, V4.

Daniel - September 11th, 2023
5 out of 5

Dave Friedman says he selected EH for his amps as reliable, and ship out standard compared to others he tried, which either failed or didn’t sound great. These and EH EL34 narrow bottle are what I found work great in Marshall Plexi 100 watt and give me all the classic British violin smooth tone I crave. Yum!

Daniel - September 9th, 2023
5 out of 5

Just like Dave Friedman said, and why he likes them. British style, old school, EH slim bottle quad EL34 with EH 12AX7 high gain preamp tubes. Gives all that I need from Marshall Plexi 100w. Very violin like, if you dig that, and that’s exactly what I want! Thanks.

Ryan Ybos Ryan's guitar repair - January 29th, 2023
5 out of 5

EH 12AX7 tubes are a great But what's even better is the customer service I received from tubes and more. With a good client's repair on the bench who is moving in a week I ordered 12AY7s accidentally. Emailed The guys at tubes and More explaining the situation the service was impeccable I received an RA number, the correct order was put in the system and shipped out immediately then the difference as well as the credit was processed in more than a timely manner. As a business owner this kind of customer service really stands out and makes a difference of who I'm going to order from in the future. Tubes and more is at the top of my list and I'm very pleased with The price and of course the service I received.

tom colopy - September 13th, 2022
5 out of 5

perfect!

clint - January 16th, 2022
4 out of 5

4.5 star

Anonymous - July 18th, 2021
5 out of 5

These are great sounding, reasonable tubes!

Paul L. - January 27th, 2021
5 out of 5

Excellent service and products!

John Bradford - June 25th, 2020
5 out of 5

Used in V1 in my Reeves 225, sounds excellent & can be recommended.

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.