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Phono preamps as a class draw almost no electricity, whether in use or idle, so providing a means of depowering them isn’t an issue. Most of ours have a power indicator so you can tell they’re plugged in, but again this is more of a convenience than a needed feature. Many stereo receivers and amps have a switched AC outlet on their rear which you can plug the preamp into if you want it depowered when not in use…. Eliminating the AC cord and moving the power supply out of the preamp itself by utilising an AC adaptor (commonly called a “wall wart” in the electronics business) has three major advantages; A)Separating the power supply physically from the preamp circuitry reduces circuit and AC noise, and improves S/N ratio. B)The power supply can be replaced in the event of lightning or surge damage without having to replace the entire preamp.
