I looked on H/K web site and found the manuals for the Citation 19 power amp and the 17 pre-amp. I saw on the last page 5/77. I'm getting these two units to run my CC L212s.
The only time I can remember seeing Citation gear in Nevada was in the mid~late 90's, in Reno. Although I may have seen some in the shop where I bought my original L212s, in '79.
I know H/K was a subidiary of Jervis, during part of the time Citation gear was available.