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How does Nagra select 845 tubes?

April 26, 2017nagra select tubes

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How does Nagra select 845 tubes?

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After a 24 hour burn-in and individual measurements on a custom Nagra benchmark amplifier, they are matched by pair and attributed to a specific VPA amplifier. The VPA is then checked to make sure the tubes meet our quality requirements, both electrically and subjectively in our listening room.