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I see no reason to modify the radio. I am sure that with good components the hum will be negligible. Getting fancy with hum bucking will only cause trouble, since it's hard to duplicate the wave with its harmonics and feed it into the amplifier. And while adding a solid state rectifier might be easy enough, it will produce higher voltages than the tube; combine that with the very common extra voltage we have these days and it invites early failure.
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