Zenith C725 help!

[TUD1]

Well I finally got the tombstone fixed, now another radio took its turn to break! I got this radio at an estate sale a few weeks ago, and I have become very fond of it. It has (had) a very clear, excellent sound. But tonight, I was listening to it, and all at once, it went completely silent. I clicked it off, and I heard a ten second long buzz that slowly faded away. The first thing I thought was that the selenium rectifier had shorted. Any ideas? I really like this radio - I just got finished giving it the Novus treatment and the cabinet is in near mint condition.