Tom, the AM radios were tube power back then, not solid state in the 50s, you need to run a speaker that has the built-on transformer or you could blow the circuits or tubes in your radio. Mutton Hollow, one of the sponsors here sells them for TriFives, I picked one up from him a few years back for my '57 tube AM Radio, built-on transformer, original specs and it is the exact replica and sounds wonderful, not much in the way of music, but lots of talk radio and ball games these days. Check out Mutton Hollow on the Sponsor forum.
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