[morzh]

Frankly my rule is never to leave any old tube radio on for long periods of time unattended.  Even if it's been recently restored.  That way if something blows up or starts to smoke, I'm there to unplug it and put out the fire! Have fun with the repairs and best of luck!

Jason

I even go further than that: all my radios are powered through power strips, and I only turn a strip on when I play a radio that is plugged in it, and after I turn of the radio, I also turn off the strip.
Better safe than sorry about losing both the collection and the house.