I was at a flea market recently and came across a Grundig TR 807, which
I bought for $20 so I would have something to play with some evenings.
The problem I have is a VERY loud hum, *both* in AC *and* DC power
modes. It brings in some stations even with using just the collapsible
antenna on the radio, so maybe it is worth salvaging-- but I have no
idea how to get around that hum.

ANY suggestions on how to fix it would be extremely appreciated.

Thanks-
Scott Anderson