I've recently acquired the subject transceiver and am looking for accessories like the AT-22 tuner, power cables, battery packs and microphone. I have the manual for the SBT-22 but not the SBT-22A-18. 

Web searching has not yielded anything useful so any leads appreciated!

The facility where this was made is two miles down the road from my house. Northrop Grumman is the current occupant of the property.

73,

Dave N9ZC