Electro-Harmonix 12AT7 EH Preamp Vacuum Tube, Single

These are a good quality tube. EH has always worked well in my amps. Can't say how long it will last since I just installed.

I replaced the 2 12AT7's with AX7's. No longer need to route the signal through a pot on the effects loop. Before that pot was installed pushing the volume on channel 1 to from 1 to 2 was deadly your ears. One AX7 made it a little better but 2 is better still.

I put a pair of these in my EHX English Muff'n as my old tubes didn't sound too great, and these did the trick! Before, I had this high-frequency hiss with my pedal, but this cleaned up that obnoxious hiss and has my pedal sounding milky and good as new. Great buy.

Tubes aren’t as magical as people will lead you to believe, but I had around a 8-10% tone improvement installing these in a Deluxe. I DID have those terrible GT tubes that comes factory installed in it, which may be why I had the bigger improvement in tone. Expect 5% better if you already have quality tubes.

The quality of the current EHX tubes seems to be an issue whereas it was not in the past. So far, the quality of this tube is very good. I have it in a Fender Deluxe Reverb, and it sounds just about on par with the "NOS" unit it replaced (that tube wasn't really NOS - just "not current production").I've got enough months/hours on this tube to confirm that there don't seem to be construction/manufacturing issues. I can't say the same for almost all of my other recent purchases of EHX preamp tubes, although they weren't 12AT7's. So that is something to keep in mind.But since it is still functioning well after a few months, that earns it 4 stars. If it lasts over a year and a half, I'd be tempted to give it 5, at least in the context of new production.

Good tube for the price. I've had good luck with them in the past.

If you have a Fender Hotrod Deluxe at home and are always worried for the huge jump in volume from just 2, replace the far left Preamp tube with this one. Perfect solution!!

I purchased this tube and an Electro-Harmonix 12AY7 EH to experiment with in one of their pedals, an LPB2UBE. The AT7 didn't actually make enough of a difference from the 12AX7 I swapped it for so I ended up using the AY7. This tube worked flawlessly however and I'll keep it safely tucked away in case I ever need it.