With these characteristics, along with the exceptionally low noise and low microphonics, the Electro-Harmonix 7025EH will work equally well in vintage and modern high-gain guitar amplifiers, as well as sensitive phono preamps. The Electro-Harmonix 7025EH has a mid-range that gives clarity and definition to the sound and a smooth top end for warmth and balance. In all samples tested, noise and microphonics could not be detected. ![]() In order to ensure that the 7025 specification is consistently met, Electro-Harmonix has redesigned the structure of the 12AX7 and has implemented construction techniques to ensure the absolute lowest noise and microphonics possible. The original 7025 tube was a 12AX7 that was tested and selected for the lowest noise and microphonics for use in the critical first preamp stages of amplifiers where noise and microphonics could be an issue. ![]() Nowadays tubes are not made this specific so the name means almost nothing except on old tubes. The 12AX7 has a gain factor of 100, while the 12AT7 has 60. It’s also more heavy duty so it can take a beating. The biggest difference between these power tubes is the amount of gain they will provide. 7025 is higher in gain and a bit brighter then the 12AX7. Electro-Harmonix has released a low noise, low microphonic version of the 12AX7 that meets all specifications required for the tube to be designated 7025. Response: In the old days the 12AX were different quality tubes.
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