[GreenKeys] Craigslist - Chicago area - M14, M15, loop supply

[Nick England]

https://chicago.craigslist.org/wcl/atq/d/yorkville-military-teletype-equipment/7379848082.html

The Navy loop supply is a PP-1767A/UG
    1 ea. 120vdc (1 amp) output
    2 ea. separate 60 ma loop outputs
    40 lbs of magnetic amp regulation........
Manual - https://www.navy-radio.com/manuals/tty/pp1767a-ug-man.pdf

I know nothing more....
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