Electro-Harmonix 7025EH Preamp Vacuum Tube

5 Reviews
SKU: EH-7025

Availability: Usually ships within 24 hours.

USD $‎28.95
Here’s something completely different from Russia. Electro Harmonix has released the all-new 7025 vacuum tube model and it’s quite a departure from their previous offering. Clearly this was new from the ground up and not a re-working of something else. The only thing that carries over from their other designs is the rather tubby bottle they fit into. This is a dual triode with very short plates, in fact the plates are open at both ends so you can see the cathodes and control grids quite easily. There has been a lot of effort to shield the triode sections, including a full plate between them to prevent interference and added support across the two triodes to cut down on vibration. A single overhead getter bridged across the triodes tops it off. The micas are not extra thick but they are clean and well aligned to hold the structure. Overall the preamp tube is well built with good alignment of the internal structures.

From our review: It’s quiet and I could find no trace of microphonics in a couple demanding guitar amps and my hifi tube audio phono stage. Tonally they are balanced and smooth. No harshness in the top end. To my ears these tubes seem to have a bit less gain than a Tung-Sol 12AX7 or the JJ Frame Grid. Regardless of your, taste from high-gain to folk, these will be great in your amp. Almost no background noise allows the high gain user to really drive the amp hard and be assured that the only feedback will be by design. At more reasonable gain levels you will find these to be warm and detailed.

Other Electro-Harmonix tubes        12AX7 Types

Additional Information and Downloads

12AX7 Tube Review

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Electro-Harmonix 7025-EH 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

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Electro-Harmonix 7025-EH | Fantastic Tube in the right amp!


Fantastic Tube in the right amp! Ordered a pair of these EH-7025, for a Class A, hand wired head amp, with mixed results. Not quite the correct fit for that amp. Lower gain than expected. Dropped them into an early blues junior and whoooo boy there it was, all the chime, the bass was right. The low gain did the thing in that amp. I had considered selling the amp until these were in it. The quiet internet rumor about Russian tubes in amps designed for them may be a thing. These things kill it in a blues junior and I don’t know how else I might say it. For those of you with a “Hot Rod” style Fender circuit, these might be a thing to try!

Electro-Harmonix 7025-EH | This tube works well in the Digitech 2101


I put a pair of these EH-7025 in a Digitech 2101 Preamp/FX module and they sound great. They are very quiet. I use the 2101 for high-gain guitar work, and this tube is up to the task. I also tried a pair of these in my Digitech 2120 which I use for Acoustic/Electric guitar work and was not that impressed. For some reason the 2120 sounds warmer with Groove Tubes. Just a data point for Digitech users.

Electro-Harmonix 7025-EH | Very Quiet


I decided to try the EH-7025, and I'm happy I did.
My amp doesn't make any noise that I can detect.
I love EH products!

Electro-Harmonix 7025-EH | Superb value!


I purchased these EH-7025 with all the options checked (hi gain, low noise, balanced). They have at least the same gain as my 12ax7 tubes. These are exceptionally smooth and grain free tubes with super low noise and deep, tight bass! In my system, they were best using 50db gain with my Pro-ject DS2 tube box (cartridge output is 2.5mv). At 45db gain, they are a little bit brighter sounding with a hint more of soundstage depth, but overall 50db gain was preferred for the best bass and grain free listen. A well balanced tube, top to bottom. They simply refuse to get sibilant, especially with 50db of gain and are easy to listen to for hours on end. One hell of a value!

Electro-Harmonix 7025-EH | Another EH first !!


An amazing tube, this new release EH-7025 is virtually noise free, and rattle free. Nice smooth tones, and good gain characteristics. I have been using these Electro-Harmonix in various Fender amps, and they have been consistent so far.