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.
Ag insider logo xs@2xsnooker14
Quincy,

While not questioning the validity of your suggestion, I am wondering about the feasibility of turning on/off the preamp before the power amp when using a tube pre and SS power. For me, my SS monoblocks are ON 24/7 while my tube pre is ON only when needed. So my preamp is always turned on/off after the power amps are ON. I hope I am not damaging my equipment doing it that way.
I thought one should always turn off amp prior to turning off preamp. This to prevent any spikes from preamp making their ways to the amp.
WELL! Thanks for the answers, but all of them seem irrelevant to me. How do you turn the amp or the pre-amp on at a different time in an integrated amp? Am I missing something here, or is it you guys? I am sure you guys have answered a very important question for somebody, but I have a different question. Ino sarcasm meant here, but I really do appreciate your trying. You guys were nice enough to respond. Thanks!
WELL! Thanks for the answers, but all of them seem irrelevant to me. How do you turn the amp or the pre-amp on at a different time in an integrated amp? Am I missing something here, or is it you guys? I am sure you guys have answered a very important question for somebody, but I have a different question. No sarcasm meant here, but I really do appreciate your trying. You guys were nice enough to respond. Thanks!
Sorry Snooker14, I need to learn not to read/respond so late at night. Integrated tube amp. (pre-amp and amp controlled by one power switch) does not permit you to perform the recommended on off schedule. Now back to your question. Three years is about the normal life span for a amp tube....you can squeeze a tad more out of pre-amp tubes. They will still work, but the sound quality and sound stage starts to degrade. It is not recommended that you keep a tube rig 'on' all the time. The tubes can be consumed in a few months. Try a new set of tubes for your rig...it's time anyway.
Regards