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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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Item ID: 004458
Starting at: $13.75
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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.

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Product Reviews

4.31 out of 5 based on 13 reviews



Good Solid Tubes
Nice Tone

Paul McIntire - October 26th, 2018

For a Fender Deluxe Reverb, Out of a full set of Electro Harmonix tubes, just pulled out the last bad one. Out of 5 tubes, 2 12AT7's and 3 12AX7's, every single one was bad. The first shot, 2 extremely microphonic 12AX7's, since they were in the return period, AES sent replacements. The 12AT7 reverb driver blew out last week (probably less than 25 hours runtime), replaced that, then this week one side of the phase inverter dropped gain suddenly. Since they are now out of warranty, I had to replace 3 bad tubes out of pocket. Until Electro Harmonix fixes their quality problems, I would not recommend their 12AX7's or 12AT7's.

Mike P - September 8th, 2018

best bang for the buck these little baby's work great in all applications, put them in high gain builds and they are awesome.

daryl stillman - August 12th, 2018

I start a copy of an EC3 audio research crossover who needs 12 12AX7. During the testing phase i use some cheap and classical EH. Then I tested with my NOS AN GE of 1960 inherited from an old radar repair and kept in a safe ... No significant difference, except perhaps in the dispersion of the characteristics.
Thanks a lot for the quick service.

Frenchy - July 22nd, 2018

I have a Marshall TSL602 and had a Mullard reissue 12ax7, cleans up very nicely, go out on V1 so I tried replacing it with what I had in my stock. I tried the EHX 12ax7 and found it to have alot of distortion on tap, very crunchy fizzy. This is good for my lead channel but the crunch channel had to be set to too much preamp to get it to sound natural, too much fizz and not enough crunch and ended up almost as distorted as the lead channel. The clean channel was something else entirely, the just starting to breakup crunch that the Mullard had was fizzy and not natural sounding. I took it out and settled on a Tung Sol 12ax7, better all around tube.

marred - August 26th, 2017

So much for the spiral filament reducing hum!The tube I ordered hummed like hell. I wish there were more concerned screening going on.

dts6587 - October 14th, 2016

Quality product. This tube sounds really good in my Marshall amp!

bruce jennings - April 4th, 2016

I have not had real good luck with guitar amplifier tubes in my Blues Jr. You can still find some RCAs around if you want to spend a fortune. I still have a good supply of RCA 6L6GCs but no 12AX7,12AT7, etc. I tried some Groove Tubes and some JJ Tesla because a lot of forums built them up. No thank you, never again. I re-tubed the amp with Electro Harmonix along with putting in a a bias adjustment and dropping the voltage so the tubes should last longer and changed out the speaker to a RED WHITE and BLUES Eminence. It is now one sweet amp. I have also had good luck with the higher grade Tung Sol 12AX7s which I put in my Fender Twin.

Michael Naylor - January 30th, 2016

The everyday gigging tube for my '64 Princeton 6G2 and my '75 Princeton Reverb.

Mickey Richard - July 1st, 2015

Great tubes for everyday use -- my goto gigging tube.

MickeyRichard - July 1st, 2015


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