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Electro-Harmonix

Electro-Harmonix KT88 Power Valve

690/KT88EH
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Ultimate KT88

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.
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