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.
Other Tung-Sol tubes 12AX7 Types
Additional Information and Downloads
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
Nice sounding 12AX7 substitute for reduced gain
I tried this tube in the V1 socket of a Hot Rod Deluxe Mk IV. The slightly reduced gain improved the volume control range and overall sound of the amp. I will warn you, though, that since it has fairly long plates, it will probably be more microphonic than a short plate tube. I used the factory supplied tube damper but still heard more feedback in the "more drive" mode (with the volume turned up loud) vs the factory installed ECC83, despite the lower gain.