We use and recommend Electro-Harmonix Gold Pin for all Ultra Low noise critical applications.

Quantities are sold with Matched Sections.

This is the gold pin version of the popular Electro-Harmonix 12AX7-EH.

The 12AX7-EH 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. I've had some samples that were tried in various amp stages. Pre-amps, tone stacks and phase inverters, a winner in every location...I have used the EH to successfully tame amps that defied 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."

The 12AX7 tube type is equivalent to the European ECC83 tube and can be used in any 12AX7 or ECC83 circuit.