Preferred Series 7025 / 12AX7
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
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Warranty Information and Return PolicyWarranty 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.
Ratings & Reviews
A simply great 12AX7
After A-B testing a bunch of 12AX7s, the 7025's came second only to NOS Mullards, with all the range - and across a sweep of volumes - but just a touch less "3D" grit when dimed. For the price, the consistency of this tube over any NOS option is a no-brainer. Creamy, breathy clarity. Great for most styles, but if you're a metal shredder you might want something a little tighter (Tung Sol?).
Wow what more can i say!
by Joseph R.
This tube rocks! A great upgrade to my Jolida Glass FX DACII...form the get go bass, mids and highs are freaking awesome! Highly recommended if you want to save on those expensive 12ax7's.
Brought New Life to the Old Ampeg!
I purchased 3 of these on the recommendation from The Tube Store. I originally thought of getting the expensive Northern Electric for V1 and Preferred Series for the rest, but the guy on the phone recommend against that choice for my amp, and instead recommended the Preferred Series for all positions. I was like, "oh really?" He said, "They'll sound great in that amp". He was right!I replaced the stock tubes that were less than 6 mos. old: A Groove Tube 12AX7-R in V1 and two Electro Harmonix 12AX7's in V2 and V3.I did a bunch of test recordings with the old tubes vs. the new, with two different basses. One with humbuckers (Musicman) and one with single coils (Warwick), both trying different playing styles (finger style and slapping).At first I didn't notice much difference, but after playing back the different recordings it became clear the that new Preferred Series tubes sounded MUCH more musical and balanced. I got the definition and clarity in the notes I was desperately looking for! The old GT and EH tubes were just as loud as the new PS tubes, so I didn't "gain" anything there, (pun intended!) but the highs of the GT are noticeably harsher and brittle sounding. The GT had more bottom, but sounded boomy and distorted slightly. The Preferred Series in V1 sounded smoother on top and much tighter and controlled on the bottom! And most importantly the mids were clear and present. The notes had been given character presence. Sweet! Overall a more pleasant and musical sound. Just what I was looking for!There are surely better tubes for more money perhaps, but these did the trick for my aging workhorse of an amp! The SVT-4 Pro is not known for an amazing tone. It was built to be powerful and that's about it. But these tubes really helped to add a better tonal quality to the amp! Highly recommended!
My performance impressions—tried 'em in two 1962-era tube receivers
Are you struggling with the question "for a vintage home stereo preamp or amp, are these worth the extra cost?" I was, so I finally bought four to trial. I dropped these into the phono & driver stages of two vintage receivers: 1) a Harman-Kardon TA5000X (same as the HK A500 integrated amp) & 2) a Kenwood KW-60. Sound is SUPERB and exactly as rated in thetubestore's comparison guide: strong and punchy, flat across the sound spectrum, dead quiet, precise at the lowest phono input levels, and nearly zero microphonics even in the phono stage (I tapped each gently with a screwdriver with barely detectable speaker output sound). They replaced original Sylvania/GE 12AX7's and Electro-Harmonix EH-12AX7's and sound similar to the GE's and better to me in gain and clean-solid bass end vs. the EH-12AX7's. YMMV, enjoy the ride, whatever you're listening to!
Best of both Worlds
The Preferred Series 7025 12AX7 is a great sounding tube.A nice low noise floor ,with excellent gain.A warm woody sound to them ,that you can push to get a great crunch that does not get too harsh.All around Great performer.