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  • Stereophile

    MEASUREMENTS

    Jul 04, 2023 5 minutes

    I performed the measurements of the Fezz Audio Silver Luna Prestige amplifier with my Audio Precision SYS2722 system,1 confirming some of the results with the higher-performance APx500. I carefully installed the tubes, following the numbered guide that had been packed with the amplifier. I carried out a complete set of tests with the 12AX7 tubes that AH had told me he preferred, with the output stage in both pentode and tetrode modes. I then repeated some of the testing with the alternative 6N2P small-signal tubes. I powered down the amplifier before changing the output modes or operating the input tube switch on the top panel. The 6N2P is not pin-compatible with the 12AX7; I assume the switch changes the internal connections.

    As usual, I waited for an hour

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