Preamp Tube - SPAX7-A

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MESA SPAX7 preamp tubes are a super-premium grade substitute for any 12AX7 positions. They are a "Special Requirement Preamp Tube" that possess an even higher standard of overall performance, due to their incredibly low sensitivity to microphonic noise. This is the ultimate preamp tube to use in all critical gain stage positions. It is the absolute best of the best!