[codefox1]

Unless all the paper and electrolytic capacitors have been replaced, there is a chance you will have some residual hum. With half wave rectifiers, this will be mostly 60 hz, and most small speakers will reproduce this with much amplitude. That is unless you have young ears.

There is one other thing, try reversing the plug in the AC socket, or move the radio to another part of the room. Lamp dimmers, battery chargers, flourescent bulbs, pc's and other modern devices can cause interference.