Quoted from o-din:Wouldn't it suck if we all started finding out that the lifespan of a transformer is only 50 years?
I know I said this before, but the first year I was out of college I saw a transformer fail at work.
My wise old engineer mentor told me I have seen the only one in my lifetime that would fail due to natural causes.
And so far after 29 years he's been right.
Transformers just don't fail unless you abuse them mercilessly