I have seen this gimmicky feature referenced in several old print advertisements and I am curious as to what “Fan-Spread Tuning” really is. Does anyone have a model that features it that could explain what it is? I’m assuming a glorified name for some form of band spread, but adverts seems to emphasize the dial itself so maybe there is something more to it?
Can you scan and post one of the ads? When I read the title to your thread I assumed that you had just mispronounced or misheard “Band Spread”, but I see you haven’t 🙂
Like you I assume that some “clever” manufacturer has taken “band spread” and made the dial like a fan?? It would be interesting to see.