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)

Download Adobe Acrobat PDF reader

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.

TST must be screening these, somewhat.


I get less scritchy scratchy noises, less hum, less microphonic noise, and less mechanical noise with these. Are they as good as the old ECG STR 7025s, ...NO. I rarely see NOS STR 7025s anymore, so these are a nice option to have. Comparing against an EI may not be such a great thing. EIs could be very inconsistent. Some were fabulous, and others horribly noisy. Telefunken did a much better job with quality control, before sending their tooling to Yugoslavia's EI factory. Needless to say, "I do miss EI very much". For the price, an occasional bad valve from them was acceptable. Seeing the war in the Balkans was hard for me. Seeing the home of the Sarajevo 1984 Winter Olympics under siege was sad indeed. I have a decent stash of EIs, along with RCA, GE, Philips Sylvania, and other low noise 7025s for 1st & 2nd gain stage uses. I was never a big fan of Telefunkens for guitar, bass, or kbd amps. For hi fi, they are great! These Preferred series valves allow me to hang onto my NOS valves for truly "special" occasions. Thanks TST! Hey, let's face it, with only 3 companies making valves now, just how competitive do you really think they will be for quality? Uhhh, yeah. Not very. One maker has visions of being the ONLY remaining maker of audio valves. God help us! Keep up the good fight TST!



Let me start by saying that the Tube Store customer service is hands down, the best. I received two Preferred Series tubes. One went bad, but they gave me no hassle at all about replacing it. Now, my review on the one that is currently in V1 of my Pro Jr. I do not find the tube harsh at all. I find it to be very balanced in tone. I had a chance to crank the amp last night at church. After hearing my tone, it is now replacing my Marshall DSL that i have been using with Mullard preamp tubes. The Preferred Series 7025 tube was made for crunchy goodness!!!

Not good for high gain guitar :S


The tube looks to be a fairly long plate and has nowhere near the gain of JJ's Engl, Sovtek. Overall a warm, soft tone.I do like high Gain Rock/metal but also look for warm chimey liquid cleans and nice low gain breakup / crunch, but it didn't do any of this for me in my gear.Engl E530 - V2 ( gain channel position ) - Gain dropped off, Sounded flat, blanket over the amp. JJ's stock 12AX7 killed it here.Engl E530 - V1 - Clean channel - flat, un-involving. Dirty Channel - Mehh smoothed of the frizzy top end with the stock Engl in V2, but dropped the gain overall and it lost some punch or power or something, Still not doing it for me.Blackstar HT Dist-X preamp pedal - Lower gain, flat, muddy. Didn't bother trying in my Blackstar HT-5.

mixed review


first off: customer service is OUTSTANDING! they are reliable, and highly ethical in their transactions. I had mixed experiences with The Preferred Series 7025 tubes. One was bad immediately; one went microphonic after very light duty usage. Jon sent me 2 replacements. So far, one sounds quite good, the other sounds even better: fuller, sweeter, nice balance of bright sparkle and sweet lows. I'd give the best tube a 5 star rating; because of inconsistent tubes, I rated them 3 1/2 stars overall. Modern tubes can be inconsistent. that seems to be the current situation. In any case, I will buy from for future purchases again. Integrity counts.



Great service and feedback from thetubestore. I found an original SWR Silverado 212 bass amp. After cleaning the scratchy pots I wanted a new tube just for preventive maintenance. I immediately noticed a drop in gain/volume compared to the stock tube. It was however very clean and quiet. The sound a little heavy in the mid range. I have used it at some very loud concert venues with great success. Loads of punch and clarity.