The Electro Harmonix 12AX7 Gold Pin is a high-grade 'GOLD PIN' version of the 12AX7EH, featuring superior high-gain "gold pins" Twin Triode short plate with ultra-low noise and a detailed, musical tone. It's an excellent replacement or upgrade for any circuit that requires 12AX7/ECC83 types. EH Gold tubes are newly designed and of exceptional quality. Many original equipment manufacturers (OEMs) use relabeled EH Gold vacuum tubes in their amplifiers. For those seeking great-sounding tubes at a very reasonable price, Electro-Harmonix tubes are a top choice.