Data Sheets for 12AX7 (original Mullard data) PDF File Click Here
For hifi & mic preamps, like Dynaco PAS, Altec 1567, etc we suggest Tesla (either kind) lowest noise & best tonal balance. We suggest the Electro-Harmonix or Philips tubes for more "vintage" tone in Fenders, and other US made guitar amps. Teslas seem to work best in Marshalls.
The new Electro Harmonix 12AX7EH is a good choice for those who want a more "vintage" sound or think the Teslas are too bright.
If you're looking for less gain & more headroom, try a Sovtek 5751 or ElectroHarmonix 12AY7.
12AX7 and 5751 (equiv. to ECC83, 12AX7, 7025) All of the 12AX7 types listed may be used to replace 7025 or 12AX7A.
Note that matched pairs of 12AX7 are not required for guitar amplifiers.
You can find curve plots for 12AX7 Chinese, Sovtek, and Tesla on our Tube
You can use 5751 to replace 12AX7 for less gain in many applications (guitar, mic & passive EQ phono preamps).
All of the tubes on this page will replace these numbers: 12AX7, 12AX7A, 7025, ECC83.
|12AX7/ECC83S Tesla/JJ Tube|
Tesla/JJ 12AX7/ECC83 These are near exact copies of exotic and rare Telefunken ECC803s.( not the flat-plate ECC83..but the really rare frame-grid style which cost $100's of dollars if you can find any). Get close to real Telefunken sound at a fraction of NOS prices! These are the latest ECC83S variety.
|12AX7 ECC803 Tesla JJ Tube|
A new 12AX7 from the JJ folks in the Slovak Republic. These are a reissue of an earlier tube that used to be made by the Tesla company, this has a long ribbed plate rather than the short wide plate of the regular JJ ECC83.
|12AX7-EH ElectroHarmonix Tube|
Electro-Harmonix 12AX7-EH...another new Russian product, the plates are slightly shorter than the 12AX7LPS. One of the most popular currently made 12AX7's.
|5751 Sovtek (Russia) Tube|
5751 Sovtek (Russia) Tube. The Sovtek 5751 is the same as Sovtek 12AX7 LPS, but has about 30% less gain, for use where more "headroom" or less gain is desired.
Big, warm, and musical. High Gain, ultra-low microphonics, and superb linearity with a dynamic 3-D sound.
|Tung-Sol 12AX7 Matched Pair|
Big, warm, and musical. High Gain, ultra-low microphonics, and superb linearity with a dynamic 3-D sound. Price is for a Matched Pair
|JJ ECC83 GOLD PINS|
JJ ECC83 GOLD PINS, special order.
|JJ ECC803 GOLD PINS|
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