Vacuum Tube - 12AT7 / ECC81, Electro-Harmonix

Vacuum Tube - 12AT7 / ECC81, Electro-Harmonix image 1
Vacuum Tube - 12AT7 / ECC81, Electro-Harmonix image 2
Click to zoom in
Vacuum Tube - 12AT7 / ECC81, Electro-Harmonix image 1Vacuum Tube - 12AT7 / ECC81, Electro-Harmonix image 2
Customer Images:
No Images yet! Submit a product image below!

Vacuum Tube - 12AT7 / ECC81, Electro-Harmonix

In Stock

Superior large plate format Twin Triode, ideal for use in driver and reverb circuits. Offers superior dissipation compared to NOS versions of this tube.

  • Excellent 12AT7 choice choice for HiFi
  • Also suitable for guitar amp circuits
  • ECC81 equivalent
Item ID:
RoHS Compliant
Product Measurements by Type
Amplification Factor50
Capacitance, each triode1.6 pF
Capacitance, input2.5 pF
Capacitance, output0.4 pF
Cathode to Heater Voltage< 200 V
Grid Circuit Resistance (Rg), Automatic Bias, Each Triode1.0 MΩ
Grid Circuit Resistance (Rg), Fixed Bias, Each Triode0.25 MΩ
Grid Reverse Current0.5 μA
Grid Reverse Current Max55 mA
Heater Current330 - 360 mA
Heater Voltage6 V / 12 V
Plate Current (Ia)< 18 mA
Plate Dissipation, per triode (Wa)3.25 W
Plate Voltage (Ua)< 330 V
Transconductance (S)4.5 mA/V
Packaging Information
Packaging Dimensions1 in. × 1 in. × 3 in.
Weight (Packaging)0.038 lbs.

My Project Lists

You must be logged in to add items to a project list.

Specifications, Files, and Documents

PDF: Specification Sheet Specification Sheet30.78 KB

Questions and Answers

No questions have been asked about this product.

Product Reviews

5.00 out of 5 based on 2 reviews
Eugene L Theodore - June 4th, 2022
5 out of 5

Item arrived on time & works well.

Tim D - December 31st, 2020
5 out of 5

Out of three 12AT7s, specifically purchased for phase inverter duties in two Fender amps (DRRI and Super Sonic 60 combo), this one is the winner. The other two, a JAN 12at7wc and JJat7, worked fine, just not as clear and strong the EHX. The amps seem to be louder and sound better. Of course, YMMV.


Tim D

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.