Yeah, that´s what happened And precisely after I had installed nos pre tubes (2 x 12AT7WA) and power tubes (2 x KT88) less than a week ago. So what is happening when that - power outage while playing a tube amp - happens? I guess it pretty is the same as cutting the power off straight without setting on standby first. And that made me think: while I know that is a no-no with a tube amp, I actually do not know why not beyond the fact that it might shorten the tubes lifespan? - As you can fathom I am totally clueless with amps what comes to the actual workings of them. So here goes: what is the risk scenario with power outage while playing a tube amp? will the power outage / powering off (without standby first) do something to the tubes? how much will the tube´s life-expectancy shorten when the above takes places Sorry for the rookie questions but I really do not know, and I did not find the answer with search. So... I´d appreciate if you could give of your experience. Oh... What is evident now is that the amp makes noticeably more background hum now when the standby is off (playing) than it used to before. The background noise with the standby engaged is pretty much the same as it was before. F**k!... Thanks!