[Milsurplus] RCA AVT-112(not -112A) Questions

[Jack Antonio]

OK, before I get started, I am specifically
referring to the AVT-112, *not* the AVT-112A.

I am just as guilty as anyone of lazily dropping
the A suffix, but it has come to my attention that
the AVT-112 and the AVT-112A are slightly different animals.
(Actually, RCA is guilty also. The manual I have has a photo
captioned AVT-112 when the photo is of the A version).

The AVT-112A has provisions for field changing the
supply voltage from 6 to 12 or 24 by changing jumpers
on a terminal strip, and removing and replacing a
metal tab underneath the tuning chart.  The AVT-112
does not have these provisions, and the supply voltage
is permanently marked on the front panel.

Questions.

1.  How common(or uncommon)is the AVT-112?

2.  Was the AVT-112 available in 12 or 24 volt versions?
(Mine is 6V).

3.  Anyone have the manual for the AVT-112 or a schematic,
so I can see if there are any subtle differences between the
two? From the top, the two seem identical, but parts layout underneath 
the chassis is different.

Thanks

Jack Antonio WA7DIA/4