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Electro Harmonix 6CA7 is a big bottle tetrode and can be substituted for the EL34-type valveElectro-Harmonix tubes are new designs 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, Electro-Harmonix tubes should be on your list.
