All user reviews of 5/5 for the Electro-Harmonix 12AX7

This original lamp tubait my head Peavey 6505 +, ie, 6 preamp tubes!
The sound and the gain are really good because this lamp is pretty neutral in terms of the sound spectrum, and its dynamics is known to be relatively good. It is brighter and much more nervous than JJ ECC83 for example, other reference material. Very good lamp therefore found in a large number of products (Vox, Marshall, Peavey etc..). Since this lamp is widely used in general, it is very hard to give an objective opinion on it. But ...

I changed 3 of the 6 lamps (become microphonic), namely by Tung-Sol 12AX7 input (V1), a JJ ECC83 in V6 (clear channel) and another Electro-Harmonix 12AX7 in V3 (loop effects).

First note: Tung-Sol 12AX7 crushes everything in its path in terms of gain. HE is a good lamp for those who want to gain correct without taking off the wallpaper from the volume pot exceeds 5 / 10. In addition, the Tung-Sol is an ultra-bright compared to the EH. Conclusion: HE is actually a lamp with a good gain and a fairly neutral sound.

Second point: the clean sound is much more velvety, meaning that the JJ ECC83 is softer than the EH, with a sound spectrum more pronounced in the midrange. The EH is definitely a lamp that combines several traits without success in a particular field.

It's a perfect light for its neutrality musical, it respects the sound of the instrument and allows for a very correct gain. That is why it is used in a large number of amps because it produces a very standard. Ideal for who wants to change a lamp into an amp without radically changing the sound.

Furthermore, very low microphonics, no background noise and high reliability. Moreover, it is a very affordable product (14.50 € on www.passion-audio-tube.com). A must.

The Electro Harmonix 12AX7 is a standard tube that can be used for a variety of applications, but I use these for my guitar amplifier.  The model of the 12AX7 is a popular tube these days because it is cheap and gets the job done pretty well.  In addition to making fine pedals, Electro Harmonix has a line of tubes, which in the 12AX7 is probably their most popular tube.  I currently have a few of these in my 1976 Fender Twin Reverb and they do the job perfectly.  While there are certainly some more expensive versions of the 12AX7 out there that sound better, Electro Harmonix's version of the tube is cheap enough where I feel that I can replace them on a consistant basis without breaking the bank every time.  At first I was a bit skeptical knowing that Electro Harmonix is a pedal company and not primarly a tube company, but after installing these in my Twin Reverb for the first time, I was pleasantly surprised and have since continued to use Electro Harmonix tubes in my amps.  I have used the Electro Harmonix 12AX7 in a few other amps as well and have gotten similar results that I have been happy with.  While different tubes won't necessarily change the sound of an amp, when good tubes are installed in your amp you know that your amp is working to the best of its ability and isn't being limited by anything.  Installing the Electro Harmonix 12AX7 in your amp will only take a little while if you are familiar with how to do so, and if not I would recommend bringing your amp down to your local music shop to get it done and maybe have them show you how to do it so you know for the future.  I was wary of chaging them myself in the past until I was shown how and now its great to be able to do so.  If you are looking for a 12AX7 tube, the Electro Harmonix 12AX7 is a great choice both in terms of price and quality.