JJ ECC803S / 12AX7 Preamp Vacuum Tube

17 Reviews

Availability: Usually ships within 24 hours.

USD $‎21.95
A premium quality ECC803 preamp tube that replaces any 12AX7 / ECC83 vacuum tube type. The JJ ECC803-S is a warm, full sounding tube, with high-gain. It's great sounding in hifi amps and guitar amps (guitar players see note below).

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

12AX7 Tube Review

Tube Matching Information:
Matched Sections Service

JJ ECC803S / 12AX7 Datasheet (PDF)

Download Adobe Acrobat PDF reader

Warranty Information and Return Policy

Warranty Period: 3 months

All 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

  • 3 stars
  • 0 reviews
  • 2 stars
  • 0 reviews
  • 1 star
  • 0 reviews

JJ ECC803S / 12AX7 | Make that Bug jump

by -

Replaced the factory Bugera tube in my Bug 5 watt. Oh my! Much fuller sound with JJ-ECC803S.
Going to get a JJ EL84 replacement next.

JJ ECC803S / 12AX7 | Fantastic tube!


This JJ-ECC803S tube is amazing! Sounds big, fat, rich in midrange and has enough gain to not make it sound too fizzy. Love it on V1 position in my Bogner Alchemist. I think this tube can be a great replacement for NOS sound, I'm sparing my NOS Tesla ECC83 and Mullard ECC83 for gigs and studio only so I gave this tube a try for a practicing purposes and I gotta say it comes really really close to the NOS sound. It's very cheap and I gave it a try and I was blown away what sound I got for such little money!

JJ ECC803S / 12AX7 | This will wake up your Marshall Plexi


This JJ-ECC803S is actually a pretty good sounding tube. i find them sonically clearer than TungSol or Mullard reissue. I use ECC803S on all preamp tube slots in my Fargen Super Lead/Bass. Slightly a hair less gain than the Tungsol or Shuguang 12ax7b, but the clarity of the notes sounded better to my ears. I find the high and low end almost “even” with a singing midrange which is great for soloing. They crunch up well without that “hazy” undertones of the regular JJ-ECC83. Dime the gain/preamp volume, the saturation is there without the fuzziness.

JJ ECC803S / 12AX7 | Great tube for harsh Fenders

by -

For 20 years I have been unhappy with the way my strat sounded through my favorite amp. Very shrill and harsh. After reading the reviews, I decided to give these JJ-ECC803S a try. Wow, exactly as advertised. Full smooth clear top end without the cringe. Thank you !!

JJ ECC803S / 12AX7 | Good value, great sound.


I have two SWR Grand Prix bass preamps I use in my stereo extended range bass rig, which also is full range enough for reproducing pre-recorded full ensemble music. I have been using the gold pin version of these tubes. Wonderful sound. They last about a year before degrading and exhibiting audible changes. I decided to try the standard pin JJ-ECC803S version. Very balanced reproduction when new at a 50% reduction in cost. Even if the replacement interval is the same, a cost effective way to save money and get the sound you want.