Description Electro-Harmonix 6CA4 / EZ81 Indirectly-heated full-wave rectifier. Equivalent to EZ81. Replaces 6CA4 or EZ81 tube types. Made In Russia 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. Electro Harmonix 6CA4 / EZ81 Data Sheet
