Vacuum Tube - 12AT7 / ECC81, Electro-Harmonix

Vacuum Tube - 12AT7 / ECC81, Electro-Harmonix

Electro-Harmonix
Vacuum Tube - 12AT7 / ECC81, Electro-Harmonix image 1
Vacuum Tube - 12AT7 / ECC81, Electro-Harmonix image 2
Customer image:<br/>"Used w/ 6SN7 in mu-follower driver"
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Vacuum Tube - 12AT7 / ECC81, Electro-Harmonix image 1Vacuum Tube - 12AT7 / ECC81, Electro-Harmonix image 2
Customer Images:
Customer image: "Used w/ 6SN7 in mu-follower driver"
$13.75
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
SKU:
T-12AT7-EH
Item ID:
004425
UPC/EAN:
609722128308
Brand:
Electro-Harmonix
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.

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Specifications, Files, and Documents

PDF: Specification Sheet Specification Sheet30.78 KB

Questions and Answers

Click each question to see its answers.
Asked by Anonymous on October 23rd, 2021.
BradWbr
October 25th, 2021
Staff Member
The EH suffix on this tube simply refers to the manufacturer that makes them. Electro Harmonix does not produce a 12AT7 without the "EH" suffix, so they should all be labeled that way.

Product Reviews

4.86 out of 5 based on 7 reviews
- April 18th, 2021
5 out of 5

Good ratio price/quality

- June 18th, 2020
5 out of 5

Refurbished Firestone “Air Chief” AM/FM tube radio circa 1950. AM worked (kinda), but FM was dead. Replaced paper capacitors with Mylar and a couple of burned up carbon resistors. Tested tubes, and many were bad or weak, so I replaced all tubes from TubesAndMore. Now works great.

- May 7th, 2020
4 out of 5

Good performer and neutral sound. Great for a Hi-Fi amp. I wish tube matching was also offered for small-signal types- it can be important when used as a power amp driver. Like all 12AT7s I have tried, their transconductance is all over the place.

- March 14th, 2020
5 out of 5

In V3 of my Tweed Blues Jr. Works great and is not microphonic. Would use again.

- March 12th, 2016
5 out of 5

Great tube. I'm trying it in my Silverface Princeton Reverb for a different sound.

- July 1st, 2015
5 out of 5

Sweet driver for my '75 Princeton Reverb.

- March 21st, 2015
5 out of 5

Bought as a spare for my vintage fender amps.

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.