Special note for 5751 types: The 5751 is not a true 12AX7, but is often used in place of a 12AX7. They only have 70% of the gain of a 12AX7, and are often used to quiet down guitar amps that have too much gain. You can learn more about this on our tone tweak info page.
One other note about the construction of these tubes is they have filaments that are almost completely encased in the plate structure. They don't "light up" brightly when working properly.
Other Sovtek tubes12AX7 Types
Additional Information and Downloads
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Warranty Information and Return PolicyWarranty 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
Great replacement for Phase Inverters
by Sasha Szlafarski
Swapped this out for an EH 12AX7 that was being used as the phase inverter for a Vox AC15CC1X. The results were a fair amount of noise reduction and a slightly more sensitive output section.
While I've never favoured Sovtek tubes in the past, this one came highly recommended for both it's fairly neutral tone and more importantly, it's durability. I wanted to make sure it would be able to handle plenty of regular use.