JJ ECC803S / 12AX7 Preamp Vacuum Tube
Note: Because this tube has a long plate structure it is susceptible to excessive microphonics and is therefore not recommended for use in combo amps or high gain stages. For these amps the JJ ECC83-S is a better choice.
Other JJ Electronics tubes
12AX7 TypesAdditional Information and Downloads
Reviews:
12AX7 Tube Review
Tube Matching Information:
Matched Sections Service
Downloads:
JJ ECC803S / 12AX7 Datasheet (PDF)
Download Adobe Acrobat PDF reader
Warranty Information and Return Policy
Warranty Period: 3 monthsAll our tubes are guaranteed for 3 months from the date of purchase. (Any exceptions will be noted on that tube's Warranty tab)
If you receive a tube that does not perform to the manufacturer's specifications, please do the following:
- contact us to get a return authorization
- return it via regular mail within 90 days from when we shipped it, and we will provide an exchange or refund of the full purchase price of the tube.
Returns not related to warranty or defect will be considered at our discretion, and are subject to a 15% restocking fee.
We can not accept returns that don't have an authorization, are past 3 month, or are returned improperly.
These guidelines may be updated without notice.
Ratings & Reviews
17 reviews
You wanna blow your nutsack off?
by Wormhole Explorer
I keep coming back to this tube. I use it in V2 in my Valveking II 100 head and the gain on this thing is so fuzzy that my palms are starting to grow hair.
Aye, 'tis smooth as a cuddly, rabid bunny rabbit hopped up on crack and steroids.
Nice, clear bassy sound
by Cosmic Adventurer
I bought this and the Shuguang 12AX7-A for a Valvestate VS100. I ran them both through clean channel with a Russian Big Muff. I instantly felt I had the bassy fuzz that I wanted.
After a few days I tried the Shuguang and I was not quite as impressed. I ran it the same way, but there was something off, and it was all very muddy and distorted, in a bad way.
So, I changed back to the JJ one day after having played a bit with the Shuguang, and I didn't change/turn anything in terms of knobs, and so I really heard that big difference.
Now, the distortion through the JJ through the Valvestate alone is good as well. Though, the same can be said for the Shuguang, probably. I recommend this for a Valvestate VS100.
Nice preamp tube for hi-fi
by Musicman419
Nice current production 12AX7 variant. Nice smooth midrange and solid bass reproduction. At first I thought the highs were a bit soft, but either my ears have adjusted, or they needed a few hours to settle in because the highs are sounding very sweet to me now. Very good dimensionality and soundstaging. I feel these are a bargain at their price for use in high end hi-fi systems. Very happy indeed.
Ecc803s
by M-it East Bay Musician
I put this tube in my Real Tube pedal and it worked wonders. It took all the shrill sound and lots of white noise away. Best in front of a clean channel.
A really good current production pre amp tube
by Andrew
I'm currently using this tube as a phase inverter on a Leak Stereo 50 HiFi amp, and the JJ is a great sounding tube. No complaints at all, and it stacks up very well compared to a Philips 7025 USA made tube when tested in the same position. And for under $15, it's worth giving a try.