Why does it take time to put out sound after being turned on?

Why does it take time to put out sound after being turned on?

Receiver needs “warm up” time before it starts working

ANSWERS:

"@kp52781

that will entirely depend on how long it takes. Not uncommon for things (power FET’s as well as power Amps)having to “warm up” before working. Of course if it is to long you may have an issues with bad solder joints or a bad components. That would warrant a disassembly and checking the components out. minimum requirement for that will be a good multimeter."