[Yoda]

My recently purchased 65 has a Custom Autosound "USA" stereo, but there is awful hum/whistle that varies with the RPM. Once the car is at cruising speed, the noise isn't as noticeable. The noise is there for both the radio and tape player so I think the problem is "electrical" rather than antenna interference.

Do these symptoms match any problem (e.g. non-resistor ignition wires/plugs, faulty ground, missing/bad inline filter, etc.)?

Any suggestions would be much appreciated.