More information regarding NRI can be found here:
https://en.wikipedia.org/wiki/National_Radio_Institute
https://people.ohio.edu/postr/bapix/NRIradio.htm
National Radio Institute (NRI) was founded in Washington D.C.
and became a division of McGraw-Hill. It shutdown in 2002.
NRI was well-known as a correspondence school for electronic technician training.
NRI also produced a line of kits such as test equipment and a simple Novice ham radio transmitter/ receiver under the NRI and Conar labels.
1937 NRI -- Radio Correspondence Course
http://ncrtv.org/members-only/scanned-materials/national-radio-institute/
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https://www.youtube.com/watch?v=_FbZBvqo5kQ
Audio is louder with strong signals, also audio is much louder when using crystal headphones for listening. Radio is running 90vdc to the plate and around 9vac to the filiment.
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https://www.youtube.com/watch?v=WAfk3xjG5wc