Get an Amprobe metering device. It clamps around the AC wire, usually in your fusebox(clamps on a single conductor)either the hot or neutral line for the circuit you want to measure. Or you can rig an AC extension cord with an opened jacket, & measure with that in series with the load in question. Use caution; don't do this if you don't understand the risks, because you could be electrocuted. Also don't do any critical listening when rigged this way for measuring; it will probably sound awful. Quiescent current measurement will be lower than with signal applied (to a power amp) outputing any appreciable amount of power.
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