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Here’s a LINK http://www.ohio.edu/people/postr/bapix/knightwb.htm to a series of articles about the KnightKit broadcaster which might be of interest to you. Follow the links in the main article for more information. One fellow has posted about building a replica of this unit.
I have one from the late ’50s which still works very well. It has a bit of hum but otherwise it sounds good.