2A3 vacuum tube made by Electro Harmonix Gold - directly-heated power triode. Gold Plated GRID
EH Gold tubes are all new designs and are of excellent quality. Many OEMs use relabeled EH Gold 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
When ordering a pair or it`s multiples, the tubes are matched free of charge in configurations: pair, quad, sextet or octet.