Originally Posted by
Val
I just discovered this site and forum. What a great resource! I've been given two 075 HF Ring Radiators. Unfortunately they were stored uncovered in a garage for years with the bullet pointing up. When you look down into the ring-gap you can see a lot of debris. I'm dying to try them out but don't dare until the gap is clear. Is there a way to clean them? Also, from the research I did on this site last night, I see that they are circa 1957. Is is possible that the diaphram is still good after all these years?