Noise when turning on/off tube amp?


I have an integrated tube amp, Cary SLI 80. For the three years I have had it, there has never been any kind of hum or noise. Now there is a 1 second white noise type reaction 15 seconds after I turn it on, and again 15 seconds after I turn it off. Is this a sign that I need to replace tubes? If so, which set of tubes should I be looking at? Calling on all tube experts! Thanks in advance for your comments.
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