Engl savage tubes question

Oct 4, 2011
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0
6
Montreal, Canada
Hi all

I noticed recently that when I disengage the standby switch on my engl savage, it takes a few second to hear the amp's hissing, whereas, before when I hit the switch you could hear the hissing immediately.

Should I take it as a sign that those tubes are starting to get crappy and that I need to replace them?

Or maybe that's totally unrelated with the tubes stuff and its a problem with other components?

Sorry for the noobish question