Electro-Harmonix 7025EH (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. 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. 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. 

Perfect for Classic valve guitar amps that require a 7025 as part of the tube set and ideal for Preamps in Hi-Fi's and recording. Specifically designed for audio uses, the 7025EH is a super quiet 12AX7 so you can place this tube anywhere you find a 12AX7 being used.

Still not sure? Check out Kev's review here