Ruby 12AU7C Selected


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Ruby 12AU7C Selected

Ruby 12AU7C Selected

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The Ruby is a select low noise 12AU7 made by the Shuguang factory in China. Excellent current production 12AU7/ECC82, it's got less gain than a current 12AX7 with a gain factor of 19 versus 100 for a 12AX7.

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