I needed to replace a tube in my Fender hybrid amp. This tube sounds much better than the stock tube did. Smoother sound throughout the entire spectrum and not as harsh and brittle as stock.Very good upgrade.

I just replaced the stock preamp tube (Sovtek 12ax7wa) with the Electro-Harmonix 12ax7eh tube in my Hartke amplifier and I notice a marked improvement in my rig's sound. This tube makes my amp's distortion sound more thick and creamy, not harsh sounding like the stock tube did. Well worth the time and money swapping the tube as it really made a noticable difference.

I recently bought a Crate V18-212. It was a great deal, money wise, but needed a makeover. It was time for the Sovtek tubes to go! I used three of these EH 12AX7's to match up to my JJ Tesla EL84's and WOW! We're talking anything from the Beatles, to Hendrix, to some Pink Floyd, even to some Brian Setzer sounds! I'm Totally in love! These pre-amp tubes make the overdrive break up slowly,more creamy than the Tung Sol set I tried, and more harmonic clarity all around. Way to go EH!