Ralph, thinking back in time to when my friends had this machine--late 1980s to early 1990s at best--there's really no electronic control equivalent in the KA line. I think chronoligcal time, it would have to be the 23 series--the first with the PowerClean module. I don't think there was an electronic control 23 series, but I could be wrong. But in reality, the 24 or 25 KA series is about as close as you'll get.
In some ways I may be all over the map, but any KA with the PowerClean module would be the equivalent. Not much changed in that design period. So a 23, 24, or 25.
[this post was last edited: 11/5/2014-19:15]