Preferred Series 7025 / 12AX7

84 Reviews
SKU: PS-7025

Availability: Usually ships within 24 hours.

USD $‎39.95
The Preferred Series 7025 is a high quality 12AX7 tube type. This tube is a reproduction of the highly regarded and sought after Mullards from the 1960s.

This 7025 is a high quality and very rugged custom 12AX7 tube produced for us in China by the Shuguang factory. The plates are manufactured out of a premium metal imported from Germany and supported with extra thick mica spacers to insure against microphonics. They are burned in and tested at the factory and then again on our digital high voltage equipment to make sure the tubes selected for you will provide outstanding tone and performance.

From our review: "A great sounding 12AX7 tube type that reminds me a little more of the ECC83 that Ei made in the old days. That's a pretty nice compliment. I compared this tube against an old Ei and Telefunken smooth plate and there was very little difference. Lots of gain with a rather low noise floor. No microphonics issues at all. Very good considering the large plate size. Spot welding may be better for microphonics than crimped plates. I tried it in all the standard guitar amp duties and it was fine. Fabulous in Blackface Fender amps. We tried this 7025 in a 66 Vibrolux reverb 2x10 combo and the tones were all there. Light and shimmering or really aggressive, it's all good."

Warranty: The Preferred Series 7025 tubes carry a 6 month extended warranty.

Other Preferred Series tubes          12AX7 Types

Additional Information and Downloads

12AX7 Tube Review

Tube Matching Information:
Matched Sections Service

Preferred Series 7025 Datasheet (PDF)

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Warranty Information and Return Policy

Warranty Period: 6 months

All our Preferred Series tubes are guaranteed for 6 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 6 months 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 6 months, or are returned improperly.

These guidelines may be updated without notice.

Super good


I wanted my Engl Screamer 50 combo to sound a lot more warm and suited for blues. I first put four of these Preferred Series 7025 in replacement of the three 12AX7 Sovtek and one 12AX7 China Groove Tube that were in. Swapping the tubes made a world of difference. It went from dull and cold as hell to sunny and warm paradise.Then I changed the two Sovtek 5881WXT for two paired SED 6L6GC and after biasing it now sounds like the amp I always wanted for bluesy and crunchy sounds. I highly recommend!

A tube we wouldn't want to be without.


It definitely has its uses in all positions. I've used it mostly in V3.

Great Tube for V1


I recently purchased a used Marshall JVM amp and thought I should change out some of the pre-amp tubes since the tubes were still original and it was a 2008 model. Honestly the amp sounded pretty good when I first fired it up but thought I would still change out the V1 and V2 just to see if I could hear a difference. I put a thetubestore Preferred Series 7025 in the V1 and a Tung-Sol 12AX7 in the V2, and my god the amp came alive and roared some sweet Marshall tone. I couldn't believe the difference and I could not be happier. I highly recommend this tube in the V1 spot.

Excellent for V1


I cynically purchased a Preferred Tube 7025 for the V1 position for my Mesa Boogie Mark V. I sampled other tubes (Tungsol, Northern Electric, Mullard) in the same position with varying results. The result was highly positive. It enriched the bass and low mids very well, giving my guitar sound an attack for which I have been wishing. The high end is clear without being harsh. I well balanced tube. Not only am I curious about the sound if I replace the other stock tubes (I think they are Mesa branded JJ), but also placing them in my Mesa Rectifier PreAmp.

excellent tubes!!


I had been lucky enough to find 4 of these used on line and thought I would give them a try. I had originally put them in my Jet City 50H along with one Tungsol with awesome results. So on a whim I decided to pull 2 out and throw into my Marshall DSL40C in V2 and V3 with 2 Tungsol's in V1 and V4. All I can say is they absolutely changed the sound of the Marshall for the better and it was good before with 4 Tungsol 12AX7's in it. Much more musical now, warmer, and smoother sounding. There is even less hiss on the red channel where I generally keep it at. I ended up ordering 2 more so I can throw them back in the Jet city. DO NOT HESITATE TO BUY THESE, GREAT TUBES!!!!! Now I cant wait to get the 2 I ordered along with the Preferred Series EL34's I order to put in the Marshall also.