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I believe the recorder that was use for the R-100 (M) is describe in an ad on e-bay as 1962 Dictaphone Dictet recorder.
Sorry, I can not comment since I did not work on the ZX5. I do know that the military was not happy not having a more militarized shortwave receiver in their inventory. The zx5 was the first step in ...

The tape recorder that was included in the R-1000 (M) package was the Dictaphone Dictet Recorder. It was at that time (1962) the state of the art in recorders. It was approximately the size of a har...
Yes this was one of my first projects while working at Zenith in their Military division. I worked with two electrical engineers on the project. The project was contracted through the government. We ...

I know the history behind this model. I was the Mechanical Engineer that worked on this design. The drum had continuous coverage over the bands. The tuning knob was improved over a factor of 6:1.