Electro-Harmonix 12AX7, Matched Pair

Bought these to replace a NOS set of RCA blackplates on my Rogue Audio amp and I must say these are incredible impressive for the price. This is not my first use of new production EH tubes, they are excellent sounding with a clean/clear sound. I don't know why people still pay top dollar for vintage NOS stuff, I suppose they're trying to fine tune and dial in an exact sound. For the price, you can not beat these as well as the new production Tungsol.

These went into my stereo pre-amp and sound open and natural. Very nice. I think they can be bettered by American NOS tubes … if you can find them and/or afford them. But this is my go to tube for every day use.

I installed this matched pair of 12AX7s in a Vox AV60 and it sounded great. They came quickly, wrapped in bubble wrap, and the package was in perfect condition. I thought the price was reasonable.

These are great sounding pre amp tubes! I was reluctant to buy again from seller because the last time I purchased a 3 pack of same tube one was dead on arrival. Trying contacting seller. No response. So I’m going to give them another chance. These are great tubes!

I bought these 12ax7 tubes after a bit of researching online. I have other Electro-Harmonix products (pedals) and they have all been great quality . These arrived sooner than I thought, which was a good suprise. Installed them in my Blackstar HT Club 40 Venue and I really could tell a difference! A lot cheaper than buying a new or different amp!

I love how these sound in my Tube box Pro-ject phono amp, but my matched pair only lasted about one year. I've gotten three or four years out of other tubes; maybe I was just lucky, or got a set that was not fated to live long. Also, they went out immediately. One evening they worked great; the next morning nothing but static distortion from my turntable. No slow death. Would recommend, but be aware that you may end up replacing them every year.

I replaced the output drivers in my Korg EMX-1SD with these tubes. Without any adjustment the signal is now clean (no his or hum) and stereo balanced. Great value.

I did not rate longevity as I am hoping I don't find out for a while. My little Vox sounds brand new now. This will be my go to company when I need tubes again.