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  1. sean sweeney

    Question on 1959 Crown SXA tube amp power supply, switching noise from half wave rectifiers?? 120hz hum.

    So I got this amp in a trade deal a few weeks ago, and after one issue of basically building it back from scratch, from a blurry schematic from 1960, I still am getting some 120hz hum when the unit is idling, with the inputs shorted. I just replaced the selenium rectifier, and that seemed to...
    • sean sweeney
    • Thread
    • 1959 amp amplifier control crown gcr monitor studio sxa tube
    • Replies: 175
    • Forum: Tube Audio
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