This is a new tube that replaces 7591 types without the resistor mod that is required with the 7591XYZ. Their height can still be an issue, though, as they measure 3 3/8" (about 9 cm) from the bottom of the base to the top of the glass. Other Electro-Harmonix tubes       7591 Types Availability: Usually ships within 24 hours. EL-7591A$39.95Price is for a matched pair.

		Questions about power tube matching? Do you need a matched quad?

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