[Milsurplus] BC-344

[LARRY D GODEK]

What system might have the 344D been associated with?  Since it's powered by 120Vac, perhaps a tower environment tuned to one of the A-G channels?  What speaker was associated with it.  Neither of my Tm 11-850-N nor TM 11-850 address the issue as i can see.
 
In the chart in front of TM 11-850 the 314 (12V) and 344D (120Vac) are standalone units, not associated with anything in particular.  Must be more info out there someplace.   Why the 250 ohm speaker/phones tap?  
 
Larry
W0OGH