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 tubes12AX7 Types
Additional 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
JJ ECC803S / 12AX7 | One of the greatest JJ tube for phase inverter for Mesa rectifiers
by A.Riant
I really love the way this JJ-ECC803s tightens the sound of Mesa rectifier in Phase inverter V5 position. NEVER heard that amp sound so good and I’m not just talking about little subtle changes
Unbelievable 😳 no more boomy bass especially on palm muting
It’s a really AWESOMENESS to play my amp now 😃
These JJ ECC803s should be already installed in all Mesa recto’s from Petaluma Mesa factory
Thanks for the very quick shipping
JJ ECC803-S / 12AX7 Gold | An NOS sound without an NOS price tag
by Bob J.
I bought a pair of these JJ-ECC803S to replace some NOS Sylvania 12AX7 tubes that were in my EAR 534 amp. The Sylvania tubes were flat and non-involving. At the price of the JJ tubes I figured if they too were non-involving I was not anything. Wow! I could not have been more wrong! After about a 12-20 hour break-in period these tubes just got better! They give me nice detail in the music, are warm and inviting when the music calls for it plus they give a nice large impression of the music. I think these are better than some NOS tubes I have tried and the best thing yet, they are quiet! No tube rush like many NOS tubes and no NOS price tag. If you have a piece of equipment that needs a 12AX7 tube, I would look to these. Great price, great sound and so far they have been reliable performers.
great for blues and marshall 1959slp
by joe moe
I tried Shuguang in my 1959SLP it was alright for the gain but it was a bit shrill and empty ...with the JJ ECC83S short plate I had gain also and still trebley on the edge....THIS ECC803S long plate gave my amp a well balanced, less gainy tone...with more headroom but still dynamic.....it works super good for OD pedals with the 1959....normally the OD pedals tend to be harsh a bit but try this tube great for that Hendrix and Stevie Ray bell tone ...your SLP will be clean as a twin but what a tone.
Too much crosstalk
by Brian
These tubes exhibit way too much crosstalk between sections for me to use in my Fender amps. Any signal being amplified by the first-stage will be heard in the second-stage output, rendering the volume control of little use below about 2 or 3. Above that setting, the second-stage gain will dominate, but phasing occurs at low settings, and there will still be sound with the volume control entirely off. Other than that, the tone is very nice, but these tubes just won't work in high-gain circuits.
Kevin london ont
by kevin Irwin
installed a pair of these in my Yaqin mc100b stero intergrated amp
very detailed sweet highs and deep controlled lows