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  • Stereophile

    MEASUREMENTS

    Sep 10, 2019 4 minutes
    —John Atkinson

    I measured the Cary SLI-80HS using my Audio Precision SYS2722 system (see the January 2008 “As We See It”1). Both the smallsignal and output tubes—all Electro-Harmonix—are numbered or marked L or R, and I installed them as instructed in the manual. Cary recommends checking the output stage bias current when the tubes are first installed and setting it to between 75mA and 85mA with the trim pots on the top panel. When the amplifier was first powered up, the left channel bias measured 79mA, the right 82mA. I checked the bias currents at intervals throughout the testing. They stabilized at 81mA and 82mA, respectively.

    The Cary amplifier’s maximum voltage gain varied with output transformer tap and output stage mode. In Ultralinear, were noninverting.

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