Originally Posted by tracyrick ...it's on, but no music is going through it?
Yes, but the amount varies hugely with the type of circuit. Generally, anything that is class A, or has significant class A biasing will draw more current when idle than something in class B. Switching amps such as class D and class T amplifiers are consume very little power when idle. The worse current draw when idle offenders are single ended class A solid state gear, and various tube topologies, particularly SET designs.
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