Preferred Series 7025 / 12AX7 Preamp Vacuum Tube
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 TypesAdditional Information and Downloads
Reviews:
12AX7 Tube Review
Tube Matching Information:
Matched Sections Service
Downloads:
Preferred Series 7025 Datasheet (PDF)
Download Adobe Acrobat PDF reader
Warranty Information and Return Policy
Warranty Period: 6 monthsPreferred Series tubes have a 6 month warranty from 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 180 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 6 months, or are returned improperly.
These guidelines may be updated without notice.
Ratings & Reviews
86 reviews
phase inverter-matched
by Daniel
Popped this into the phase inverter of my Egnater Tweaker 15. I used to leave my bright switch on, but now it's too bright with it on. Which is nice because I really have more frequency to work with. Clear and open. Really made a huge difference. There is no hype here, it's the real deal. No regrets.
Great Replacements!
by Justin
I have a Blackstar HT-60 Stage and one of the preamp tubes went BADLY microphonic so I needed a replacement! I'm really glad I didn't buy the normal Chinese garbage that comes with the amp and I decided to spend the little extra cash! Like others said it REALLY tightens up the sound and gives is an almost "brighter" sound.. but honestly i think that's most likely because it tightened up the sound so much it seems cleaner! Not much i can say against them installed simple enough and sound great!
Warmer, brighter... stronger
by Daniel
Excellent tube. I changed my Jan-GE tube for this one on a Mic Preamp, the result....Incredible, the vocals sounded bigger, warmer with a lot more definition and clarity. Every little sound was captured by my mic when this baby starts to work... My experience - it became a total different preamp sound for the better of course...
Happy in a Supro T Bolt
by James
I put the Preferred Series 7025 / 12AX7 in an old Supro T bolt. The only preamp tube that has sounded good previously is the old RCA
12AX7. The PS-7025 was a relief. They have good power, good harmonics, tone and sound very close to the original. They also add a little punch w/o tone loss. I very was happy with them.
Thx
James
Marshall Haze Premium Pkg
by Jdub
I recently did a tube overhaul on my Marshall Haze 40 combo. What a difference these tubes make!! This amp has always been to muddy for my liking, with the stock Marshall tubes and JJ's. Now, the amp is much more alive -- tight bottom, Marshall growl, and clean, crisp highs. I changed both the pre-amp and power tubes with the Premium Pkg of SED Winged C EL34 and Preferred Series 7025... definitely worth every penny!! Thanks!