JJ ECC803S / 12AX7

16 Reviews

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USD $‎23.95
A premium quality ECC803 tube that replaces any 12AX7 / ECC83 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)

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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

16 reviews

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This is the magic one


I have a Twin with JBL's and I wanted more overtones and sweetness.
This tube gave me all and more.
Then I put one in the reverb circuit and WOW.
I finally got the tone I've wanted for the last ten years!!!!!

A really good current production pre amp tube


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.

Great Pre-amp tube in overdrive slot


I'm using this pre-amp tube in my V2 slot (Over Drive) of my Peavey Classic 50 Head. I'm getting the warmest fullest tone that cuts out most of the high's and brings in the bass and mids without being saturated and muddy. This Tube works wonders!



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.

Nice preamp tube for hi-fi


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.