Looking for info on this mystery RTL mic

  • Thread starter Thread starter radkins
  • Start date Start date
Could it have something to do with Shure? They were based in Evanston for many years.
 
The company existed in the 20s and 30s, mostly making tube and battery testing equipment. Antique Radio Forums • View topic - rtl type M tube tester. Need manual/schematic. It was sold to Charles Pierce in 1938. He made wire recorders and dictation equipment. Pierce Wire Recorder Company

One source thinks the microphone might have been a predecessor to the EV 630 RTL Radiotechnic Laboratory Microphone | This is a dynamic m… | Flickr
5667082945_5262e95daf_b.webp E-V_630.webp
 
Thanks. I wonder if its possible to put a date on this thing.
 
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