their KA10 had a paging box, made by System[s]
Concepts
Speaking of which, here's a photo of the display panel from it:
http://ana-3.lcs.mit.edu/~jnc/tech/jpg/SysConKAPanel.jpg
The meter didn't show up well in that, and it's too cool to miss, so here:
http://ana-3.lcs.mit.edu/~jnc/tech/jpg/SysConMeter.jpg
is a shot of it.
Noel