The Electro-Harmonix 12AX7 preamp tube has a nice balanced sound, a very low noise floor and excellent performance in terms of microphonics. The lack of microphonics may be due in part to the return of a shorter plate structure or better materials. Try them in various amp stages to test their characteristics in the different positions.
When should I use an Electro-Harmonix 12AX7?
Pre-amps, tone stacks and phase inverters, a winner in every location. The EH 12AX7 preamp tube successfully tames amps that defy all other attempts to kill microphonics and unwanted feedback. This tube is a winner, buy ’em and try ’em, they may be just the piece you’ve been looking for.
Superior high gain short plate format Twin Triode, with ultra-low noise and detailed, musical tone. Most popular replacement for all circuits requiring 12AX7/ECC83 types.
• Ultra-low noise thanks to unique spiral filament which eliminates cathode-to-filament induced hum on certain amps
• Best all-around choice and best value for 12AX7
• ECC83/7025 equivalent
• Many OEMs use relabeled Electro-Harmonix vacuum tubes in their amplifiers
Electro-Harmonix tubes are all new designs and are of excellent quality. Many OEMs use relabeled Electro-Harmonix vacuum tubes in their amplifiers. If you want great sounding tubes at a very reasonable price, then Electro-Harmonix tubes should be on your list.