Hello Wiking 85
Don't have much info on the Ju 88A-13 either, but will gladly share what I have.
The A-13 was an A-4 conversion. My sources claim it was armed with 10 to 16 7.9 mm MG 17's in pods hung from ETC racks under the wings. Protection was provided by 4 MG 81's. Max bomb load was 1100 pounds. The load consisted of small fragmentation bombs, although no bomb sight was carried. Additional armor was provided to protect crew, engines and fuel tanks. Power was supplied by 2x1200 Jumo 211H motors. Loaded weight was 28,600 pounds, ceiling 23,620 feet, and max speed was 261, altitude not stated. Wing span was listed at 65' 10.5" and length given as 47' 1.5".
As for number built/converted, when used, and by which units, I have no information on that.
Eagledad
Sources: Warplanes of the Third Reich
Combat Aircraft of WW2
The Junkers Ju 88A, profile # 29