If the controls are scratchy and erratic it doesn't necessarily mean that they are bad. First try cleaning them with an electronic spray cleaner or a drop of alcohol. Noisy controls can also be caused by DC voltage on them do to a leaky capacitor feeding it from the preceding stage. It only takes a small amount of DC to make it sound scratchy. Generally they cannot be rebuilt unless you have a collection of similar units to interchange parts and are willing to go through the trouble.
I have a similar question! I own a 1960 Zenith console. The radio works fine--phenomenal sound. However the Cobramatic turntable does not work. I suspect the problem is in selector switch because amps don't fire up on "Phono" setting either; only radio. No broken wires that I can see. Don't have original manual so I don't know if turntable "on" switch also fires up amps when selector is in "Phono" setting. So problem may be there. I've attached pix...any thoughts?
BTW I have experience with these, a 1958 Grundig Majestic (everything works) and a 1959 Motorola console (everything works) as well as a 1965 Claretone (everything works). Never had this prob before.
Photo 1: http://i416.photobucket.com/albums/pp246/michigindie/16Ffront.jpg
Photo 2: http://i416.photobucket.com/albums/pp246/michigindie/16Fstereo.jpg
Photo 3: http://i416.photobucket.com/albums/pp246/michigindie/Zen-combo-phono.jpg
BTW I have experience with these, a 1958 Grundig Majestic (everything works) and a 1959 Motorola console (everything works) as well as a 1965 Claretone (everything works). Never had this prob before.
Photo 1: http://i416.photobucket.com/albums/pp246/michigindie/16Ffront.jpg
Photo 2: http://i416.photobucket.com/albums/pp246/michigindie/16Fstereo.jpg
Photo 3: http://i416.photobucket.com/albums/pp246/michigindie/Zen-combo-phono.jpg
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