Yes magnetic. oxide coated paper tape. Helical scan on 3” wide tape. 9”/min tape speed. 24 hours on a reel. Used to record air-ground and ship-shore comms. 
Nick K4NYW 

On Thu, Dec 22, 2022 at 8:29 PM W2HX <w2hx@w2hx.com> wrote:

Very surprising it would use paper and not magnetic. I guess it could be done but seems unintuitive.

 —————————

More info from Nick England:

See RD-115 info at the bottom of this page. 

Original 1952 contractor was Soundscriber. 

Uses “red oxide coated paper tape”

 

 

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