- INFO - Selling a Vintage Zenith Solid State Circle Of Sound AM FM Radio Model J 421 W in as-is condition. Radio does turn on consistently and work sometimes, mainly for AM, but inconsistently. Could be a quick fix for someone knowledgeable! - USED CONDITION - Items sold in "used" condition may feature some signs of normal wash and wear, especially if the item is vintage or antique. No returns or exchanges are accepted on used items - all used items are purchased "as-is".