AMERICAN MARCONI - TYPE 'D' TUNER and DETECTOR
Type: Tuner
Wavelength: See text. Explanation is poor.
type_d_tuner_2.jpg
Download image to enlarge. 

 
Looking for an actual photo of the Type D tuner . Contact: jerry.proc@sympatico.ca

 Credits and References:

1) Steve Rosenfeld <oceangate(at)comcast.net>
2) Al Klase <ark(at)ar88.net>
3) Catalogue of Used Apparatus - Marconi Company of America.

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July 7/20