Replace that rectifier!
When I bought my first Zenith (1950 AM/FM Model H724), the radio emitted a spark minutes after I turned it on, then smoked (and smelled like sulfer). I immediately shut it off and unplugged it, and sent it up to my dad for repairs. He obviously replaced the fried rectifier with a new silicon diode, and after replacing all caps and the power cord, plus a much needed cleanup and tube checkup, it now operates flawlessly (and sounds good, too).
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~Jim Tidwell~
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